Here's hoping Barbra Streisand doesn't rain on Rosie O'Donnell's parade May 22. TV Guide Online has learned that the departing talk show host has asked Babs to perform her signature song, "People," on the final Rosie O'Donnell Show.

"Yes, Rosie has asked Barbra to perform," the Funny Girl's manager, Marty Erlichman, confirms. "But I don't know if she can do it. Barbra is currently off on holiday, so I haven't had a chance to talk to her about it."

After much on-camera begging, O'Donnell welcomed Streisand onto her show in November 1997. Two years later, she visited the singer-actress-director-diva at her Southern California home for a two-part interview. This would be the first time, however, that Streisand would serenade the Queen of Nice.

A spokeswoman for Rosie would not confirm (or deny) that O'Donnell put a feeler out to her idol, saying only that, "We're hopeful that a lot of our favorite guests will stop by before the end of the season." (Tommy, can you hear her?)

O'Donnell — who is quitting her daily chatfest to spend more time with her family — is passing on the baton to comic Caroline Rhea. But she's by no means leaving the biz altogether: The nearly 40-year-old Long Island, N.Y., native plans to adapt her upcoming memoir, Find Me, into a one-woman Broadway show.