The singer's latest album, Partners, has gone platinum.
The pair will be joined by Sierra Boggess.
The group will kick off its residency at 54 Below.
The stars will sing love songs at 54 Below.
The actresses will reunite to perform a pair of famous tunes without microphones.
The solo show is set to return in 2015.
Michael Esper and Rachel Tucker will also take part in the CD signing.
Jeremy Jordan and Anna Kendrick are the newest Jamie and Cathy to be recorded for posterity.
Allison Williams leads a cast that also features Christopher Walken, Kelli O'Hara, and more.