Michelle Williams, Jason Segel Have "Super Giggly" Date

Michelle Williams, Jason Segel Have "Super Giggly" Date

Marilyn meets Marshall!

A source tells Us Weekly that Michelle Williams, 31, and How I Met Your Mother's Jason Segel, 32, joked over wine for four hours at L.A.'s Chateau Marmont Feb. 27.

"They were super giggly," says a witness, who adds that Williams's BFF and Segel's Freaks and Geeks co-star Busy Philipps, joined the pair briefly before leaving.

For more on inside details on the pair's wine-fueled evening, watch this week's Hot Stuff Video, as told by Us Weekly senior editor Ian Drew.

Also in the roundup: How Eva Mendes is trying to take the next step with her beau of six months Ryan Gosling, inside details on the demise of Dennis Quaid and Kimberly Buffington-Quaid's divorce and new mom Charlize Theron mixing it up with a certain hot vampire-playing actor.