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                                                                    Exhibit 3.31

                          CERTIFICATE OF INCORPORATION

                                       OF

                           PLAYBOY INTERNATIONAL INC.

1.   The name of the Corporation is Playboy International. Inc.

2.   The address of its registered office in the state of Delaware is
     Corporation Trust Center, 1209 Orange Street, in the City of Wilmington,
     County of New Castle. The name of its registered agent at such address is
     The Corporation Trust Company.

3.   The nature of the business or purposes to be conducted or promoted is:

     To engage in any lawful act or activity for which corporations may be
organized under the General Corporation Law of Delaware.

     To manufacture, purchase or otherwise acquire, invest in, own, mortgage,
pledge. sell, assign and transfer or otherwise dispose of, trade, deal in and
dead with goods. wares and merchandise and personal property of every class and
description.

     To acquire, and pay for in cash, stock or bonds of this corporation or
otherwise, the good will, rights, assets and property, and to undertake or
assume the whole or any part of the obligations or abilities of any person,
firm, association or corporation.

     To acquire, hold, use, sell, assign, lease, grant licenses in respect of,
mortgage or otherwise dispose of letters patent of the United States or any
foreign country, patent rights, licenses and privileges, inventions,
improvements and processes, copyrights, trademarks and trade names, relating to
or useful in connection with any business of this corporation.

     To acquire by purchase, subscription or otherwise, and to receive, hold,
own, guarantee, sell, assign, exchange, transfer, mortgage, pledge or otherwise
dispose of or deal in and with any of the shares of the capital stock, or any
voting trust certificates in respect of the shares of capital stock, scrip,
wants, rights, bonds, debentures, notes, trust receipts, and other securities,
obligations, choses in action and evidences of indebtedness or interest issued
or created by any corporations, joint stock companies, syndicates, associations,
firms, trusts or persons, public or private, or by the government of the United
States of America, or by any foreign government, or by any state, territory,
province, municipality or other political subdivision or by any governmental
agency, and as owner thereof to possess and exercise all the rights, powers and
privileges of ownership, including the right to execute consents and vote
thereon, and to do any and all acts and things necessary or advisable for the
preservation, protection, improvement and enhancement in value thereof.

     To borrow or raise money for any of the purposes of the corporation and,
from time to time without limit as to amount, to draw, make, accept, endorse,
execute and issue

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promissory notes, drafts, bills of exchange, warrants, bonds, debentures and
other negotiable or non-negotiable instruments and evidences of indebtedness,
and to secure the payment of any thereof and of the interest thereon by mortgage
upon or pledge, conveyance or assignment in trust of the whole or any pan of the
property of the corporation, whether at the tine owned or thereafter acquired,
and to sell, pledge or otherwise dispose of such bonds-r-other obligations of
the corporation for its corporate purposes.

     To purchase, receive, take by grant, gift, devise, bequest or otherwise
lease, or otherwise acquire, own, hold, improve, employ, use and otherwise deal
in and with real or personal property, or any interest therein, wherever
situated, and to sell, convey, lease, exchange, transfer or otherwise dispose
of, or mortgage or pledge, all or any of the corporation's property and assets,
or any interest therein, wherever situated.

     In general, to possess and exercise all the powers and privileges granted
by the General Corporation Law of Delaware or by any other law of Delaware or by
this Certificate of Incorporation together with any powers incidental thereto,
so far as such powers and privileges ate necessary or convenient to the conduct,
promotion or attainment of the business or purposes of the corporation.

     The business and purposes specified in the foregoing clauses shall, except
where otherwise express, be in nowise limited or restricted by reference to, or
inference from, the terms of any other clause in this Certificate of
Incorporation, but the business and purposes specified in each of the foregoing
clauses of this article shall be regarded its independent business and purposes.

4.   The total number of shares of stock which the corporation shall have
     authority to issue is:

          1,000  at $1.00 par value

     At all elections of directors of the corporation, each stockholder shall be
entitled to as many votes as shall equal the number of votes which (except for
such provision as to cumulative voting) he would be entitled to cast for the
election of directors with respect to his shares of stock multiplied by the
number of directors to be elected by hits, and he may cast all of such votes for
a single director or may distribute them among the number to be voted for, or
for any two or more of them as he may sec fit.

5.   The name and mailing address of each incorporator is as follows:

<Table>
<Caption>
     NAME                                        MAILING ADDRESS
     ----                                        ---------------
                                              
     Playboy Enterprises International Inc.      680 N. Lake Shore Drive
                                                 Chicago Illinois 60611
</Table>

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     The name and mailing address of each person who is to serve as a director
until the first annual meeting of the stockholders or until a successor is
elected and qualified as follows:

<Table>
<Caption>
     NAME                                        MAILING ADDRESS
     ----                                        ---------------
                                              
     Christie Hefner                             680 N. Lake Shore Drive
                                                 Chicago, Illinois 60611

     Howard Shapiro                              680 N. Lake Shore Drive
                                                 Chicago, Illinois 60611
</Table>

6.   The corporation is to have perpetual existence.

7.   In furtherance and not in limitation of the powers conferred by statute,
     the Board of Directors is expressly authorized:

     To make, alter or repeal the by-laws of the corporation.

     To authorize and cause to be executed mortgages and liens upon the real and
personal property of the corporation.

     To set apart out of any of the funds of the corporation available for
dividends a reserve or reserves for any proper purpose and to abolish any such
reserve in the manner in which it was cited.

     To designate one or more committees, each committee to consist of one or
more of the directors of the corporation. The board may designate one or more
directors as alternate members of any committee, who may replace any absent or
disqualified member at any meeting of the committee. The by-laws may provide
that in the absence or disqualification of a member of a committee, the member
or members present at any meeting and not disqualified from voting, whether or
not such member or members constitute a quorum, may unanimously appoint another
member of the board of directors to act at the meeting in the place of any such
absent or disqualified member. Any such committee, to the extent provided in the
resolution of the board of directors, or in the bylaws of the corporation, shall
have and may exercise all the powers and authority of the board of directors in
the management of the business and affairs of the corporation, and may authorize
the seal of the corporation to be affixed to all papers which may require it;
but no such committee shall have the power or authority in reference to the
following matters: (i) approving or adopting, or recommending to the
stockholders, any action or matter expressly required by the Delaware General
Corporation Law to be submitted to stockholders for approval or (iii) adopting,
amending or repealing any by-law of the corporation.

     When and as authorized by the stockholders in accordance with law, to sell,
lease or exchange all or substantially all of the property and assets of the
corporation, including its good will and its corporate franchises, upon such
terms and conditions and for such

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consideration, which may consist in whole or in part of money or property
including shares of stock in, and/or other securities of, any other corporation
or corporations. as its board of directors shall deem expedient and for the best
interests of the corporation.

8.   Elections of directors need not be by written ballot unless the by-laws of
     the corporation shall so provide.

     Meetings of stockholders may be held within or without the State of
Delaware, as the by-laws may provide. The books of the corporation may be kept
(subject to any provision contained in the statutes) outside the State of
Delaware at such place or places as may be designated from time to time by the
board of directors or in the by-laws of the corporation.

     Whenever a compromise or arrangement proposed between this corporation and
its creditors or any class of them and/or between this corporation and its
stockholders or any class of them, any court of equitable jurisdiction within
the State of Delaware may, on the application in a summary way of this
corporation or of any creditor or stockholder thereof or on the application of
any receiver or receivers appointed for this corporation under the provisions of
Section 291 of Title 8 of the Delaware Code or on the application of trustees in
dissolution or of any receiver or receivers appointed for this corporation under
the provisions of Section 279 of Title 8 of the Delaware Code order a meeting of
the creditors or class of creditors, and/or of the stockholders or class of
stockholders of this corporation, as the case may be, to be summoned in such
manner as the said court directs If a majority in number representing
three-fourths in value of the creditors tar class of creditors, and/or of the
stockholders or class of stockholders of this corporation. as the case may be,
agree to any compromise or an arrangement and to any reorganization of this
corporation as a consequence of such compromise or arrangement, the said
compromise or arrangement and the said reorganization shall, if sanctioned by
the court to which the said application has been made, be binding on all the
creditors or class of creditors, and/or on all the stockholders or class of
stockholders, of this corporation, as the case may be, and also on this
corporation.

9.   The corporation reserves the right to amend, alter, change or repeal any
     provision contained in this Certificate of Incorporation, in the manner now
     or hereafter prescribed by statute, and all rights conferred upon
     stockholders herein are granted subject to this reservation.

10.  A director of the corporation shall not be personally liable to the
     corporation or its stockholders for monetary damages for breach of
     fiduciary duty as a director except for liability (i) for any breach of the
     direcm tor's duty of loyalty to the corporation or its stockholders, (ii)
     for acts or omissions not in good faith or which involve intentional
     misconduct or a knowing violation of law, (iii) under Section 174 of the
     Delaware General Corporation Law, or (iv) for any transaction from which
     the director derived any improper personal benefit.

     WE THE UNDERSIGNED, being each of the incorporators hereinbefore named, for
the purpose of forming a corporation pursuant to the General Corporation Law of
the

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State of Delaware, do make this Certificate, hereby declaring and certifying
that this is our act and decd and the facts herein stated are true, and
accordingly have hereunto set our hands this 28th day of October, 1999.

                            PLAYBOY ENTERPRISES INTERNATIONAL, INC.


                            By: /s/ Howard Shapiro
                               -------------------------------------
                                Howard Shapiro
                                Executive Vice President, Law and Administration
                                General Counsel and Secretary

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                            CERTIFICATE OF AMENDMENT

                                       OF

                          CERTIFICATE OF INCORPORATION

PLAYBOY INTERNATIONAL, INC., a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware,

     DOES HEREBY CERTIFY:

     FIRST: That the Board of Directors of said corporation, by the unanimous
written consent of its members, filed with the minutes of the Board, adopted a
resolution proposing and declaring advisable the following amendment to the
Certificate of Incorporation of said corporation:

          RESOLVED, that the Certificate of Incorporation of PLAYBOY
          INTERNATIONAL, INC. be amended by changing the first Article
          thereof so that, as amended, said Article shall be and read
          as follows:

     The name of the Corporation is PLANET PLAYBOY, INC.

     SECOND: That in lieu of a meeting and vote of stockholders, the
stockholders have given unanimous written consent to said amendment in
accordance with the provisions of Section 228 of the Genera! Corporation Law of
the State of Delaware.

     THIRD: That the aforesaid amendment was duly adopted in accordance with the
applicable provisions of Sections 242 and 228 of the General Corporation Law of
the State of Delaware.

     IN WITNESS WHEREOF, said corporation has caused this certificate to be
signed by Howard Shapiro, its Senior Vice President and Secretary, this 7th day
of January, 2000.

                                        PLAYBOY INTERNATIONAL, INC.


                                        By: /s/ Howard Shapiro
                                           -------------------------------------
                                            Howard Shapiro
                                            Senior Vice President and Secretary