I'd previously touched on Sigourney Weaver joining the cast of the Tina Fey/Amy Poehler comedy Baby Mama, about a single woman and aspirant mom who hires a surrogate mother to carry a child to term. It seems like the former Saturday Night Live Weekend Update deskmates are an attractive commodity to costars, as, per The Hollywood Reporter, Maura Tierney and Greg Kinnear have now also joined the cast.

Tierney will play Fey's more conventional sister, a natural mother of two who nonetheless supports her sister's choice. Kinnear, meanwhile, will play the male lead — the owner of a local juice shop who becomes romantically entangled with Fey's character as she begins her pursuit of a surrogate. One presumes, then, that some mention will be made of squeezing melons...