<Page>
Exhibit 99.CERT
CERTIFICATIONS
Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002
I, Robert S. Dow, certify that:
1. I have reviewed this report on Form N-CSR of Lord Abbett Blend Trust;
2. Based on my knowledge, this report does not contain any untrue statements
of material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered
by this report;
3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations, changes in net
assets, and cash flows (if the financial statements are required to
include a statement of cash flows) of the registrant as of, and for, the
periods presented in this report;
4. The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Rule 30a-2(c) under the Investment Company Act of 1940) for
the registrant and have:
a) designated such disclosure controls and procedures to ensure that
material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within
those entities, particularly during the period in which this
report is being prepared;
b) evaluated the effectiveness of the registrant's disclosure
controls and procedures as of a date within 90 days prior to the
filing date of this report (the "Evaluation Date"); and
c) presented in this report our conclusions about the effectiveness
of the disclosure controls and procedures based on our evaluation
as of the Evaluation Date;
5. The registrant's other certifying officers and I have disclosed, based on
our most recent evaluation, to the registrant's auditors and the audit
committee or the registrant's board of trustees (or persons performing
the equivalent functions):
<Page>
a) all significant deficiencies in the design or operation of
internal controls which could adversely affect the registrant's
ability to record, process, summarize, and report financial data
and have identified for the registrant's auditors any material
weaknesses in internal controls; and
b) any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrant's
internal controls; and
6. The registrant's other certifying officers and I have indicated in this
report whether or not there were significant changes in internal controls
or in other factors that could significantly affect internal controls
subsequent to the date of our most recent evaluation, including any
corrective actions with regard to significant deficiencies and material
weaknesses.
Date: March 25, 2004
By: /s/ Robert S. Dow
-----------------
Robert S. Dow
Chief Executive Officer,
Chairman and President
<Page>
CERTIFICATIONS
Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002
I, Joan A. Binstock, certify that:
1. I have reviewed this report on Form N-CSR of Lord Abbett Blend Trust;
2. Based on my knowledge, this report does not contain any untrue statements
of material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered
by this report;
3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations, changes in net
assets, and cash flows (if the financial statements are required to
include a statement of cash flows) of the registrant as of, and for, the
periods presented in this report;
4. The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Rule 30a-2(c) under the Investment Company Act of 1940) for
the registrant and have:
a) designated such disclosure controls and procedures to ensure that
material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within
those entities, particularly during the period in which this
report is being prepared;
b) evaluated the effectiveness of the registrant's disclosure
controls and procedures as of a date within 90 days prior to the
filing date of this report (the "Evaluation Date"); and
c) presented in this report our conclusions about the effectiveness
of the disclosure controls and procedures based on our evaluation
as of the Evaluation Date;
5. The registrant's other certifying officers and I have disclosed, based on
our most recent evaluation, to the registrant's auditors and the audit
committee or the registrant's board of trustees (or persons performing
the equivalent functions):
<Page>
a) all significant deficiencies in the design or operation of
internal controls which could adversely affect the registrant's
ability to record, process, summarize, and report financial data
and have identified for the registrant's auditors any material
weaknesses in internal controls; and
b) any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrant's
internal controls; and
6. The registrant's other certifying officers and I have indicated in this
report whether or not there were significant changes in internal controls
or in other factors that could significantly affect internal controls
subsequent to the date of our most recent evaluation, including any
corrective actions with regard to significant deficiencies and material
weaknesses.
Date: March 25, 2004
By: /s/ Joan A. Binstock
--------------------
Joan A. Binstock
Chief Financial Officer and Vice President