Lea DeLaria's recent cabaret performances at the Public Theater's Joe's Pub in Manhattan have proved so successful that two extra dates have been added. In addition to her May 3 engagement, DeLaria will perform May 7 and 8. The act, titled "It's Delightful, It's Delicious, It's DeLaria," inaugurated the new "Diva Series" at Joe's Pub April 19. All shows are at 8:30 PM.

DeLaria is backed by a three-piece band and sings a variety of jazz and Broadway selections, spiced with bits of comedy.

Also on Joe's Pub's spring schedule are:
* Mary Cleere Haran and accompanist Richard Rodney Bennett, in a tribute to Fred Astaire (part of the "Diva Series"), May 10 and 11.
* Singer Ann Hampton Calloway, performing selections from her new album "Easy Listening" (also part of the "Diva Series"), May 13-15, 20 22.
* Another "Diva Series" member, Ute Lemper, singing Kurt Weill, May 26 28, June 3-5.
* Composer Jason Robert Brown (not a diva), performing music from his musical Parade, May 17.

Joe's Pub, a new bar and night spot enclosed with the Public Theater, opened its doors last fall. It has since housed such talents as Audra McDonald, Comden and Green and Dawn Upshaw.

For information, call (212) 239-6200. -- By Robert Simonson