Quaid to Meg -- Shut It, For Jack's Sake!

Dennis Quaid has heard just about enough squawking from Meg Ryan about their messy divorce.

And now he's swinging back at her, telling Rush & Molloy she's "unbelievable" for dishing on the breakup while pushing her latest flick, "The Women." He's especially PO'd that their son Jack has to relive the whole thing again in the press.

Meg told mags and shows Dennis was unfaithful and wanted to "fill in the gaps" for people.

Not that she doesn't make this entirely obvious on the show, but Elisabeth Hasselbeck is apparently "really upset" with her left-field co-stars Joy Behar and Whoopi Goldberg.

Of course, as a "longtime staff member" tells the Chicago Sun-Times, "It's not as bad as during the Rosie era," but Barbara Walters has had to intervene and call a "cooling off" meeting to keep things from boiling over.

Buzz is -- Elisabeth might spend some time over at FOX News, possibly anchoring her own show.

As TMZ knows – because we were there -- Jermaine Dupri had a great time on his birthday. And now we're finding out just how great.

Spies at Tenjune tell the New York Post Jermaine was partying with Ne-Yo, Busta Rhymes, and Ice-T into the night, but things ended a bit abruptly for Dupri when he booted into Ms. Jackson's lap. Janet bailed immediately.