I wrote recently about Sigourney Weaver’s success in negotiating the perils of aging in Hollywood, and her success in balancing projects of wildly dissimilar tone. And The Hollywood Reporter now indicates that Weaver is in negotiations to join Tina Fey and Amy Poehler in the comedy Baby Mama, the directorial debut of former Saturday Night Live, Thunderbirds and Undercover Brother writer Michael McCuller.

The film, for Universal, is about a single professional woman (Fey) whose desire to have a child and simultaneously maintain her career track leads her to hire a surrogate (Poehler); Weaver will play the owner and operator of the surrogate agency that Fey’s character uses.

Coming on the heels of her recently released work in Jake Kasdan’s The TV Set and Marc Evans’ Snow Cake, opposite Alan Rickman, Weaver’s turn in Baby Mama will follow appearances in the presidential assassination thriller Vantage Point, with William Hurt, Forest Whitaker and Dennis Quaid, and her co-starring role in James Cameron’s highly anticipated Avatar. Fleet of foot and multi-talented, Weaver is definitely following through on her advice of mixing it all up with parts big, small, funny and sad, and in the process remaining one of the more flatly enjoyable screen presences out there; when you see her, you know you’re going to get something interesting, whatever the context surrounding it.