Baby Mama (Tina Fey, Amy Poehler, Sigourney Weaver, Steve Martin) — Saturday Night Live producer Lorne Michaels takes two of his current stars, Tina Fey and Amy Poehler, and moves to the big screen with an improbable comedy about a busy working woman (Fey) who wants a baby but apparently can’t have one on her own. She signs up with a surrogate service run by Sigourney Weaver’s character (the aging star of Alien, Dave and Working Girl), and that leads her to Amy Poehler’s “white trash” character. The rest is totally predictable fun. Just don’t take it seriously, and you’ll enjoy the interplay, particularly every moment Steve Martin is on the screen as Fey’s boss, the spiritually-driver owner of what can only be Whole Foods. Tiny Fey has emerged as a break-out star thanks to 30 Rock, the latest in TV’s story of a TV show (in this case, a Saturday Night Live-type show). She has come to stardom late so she seems less taken with herself as other younger stars, and that holds much of her appeal. She can be pretty and sexy, but mostly she’s just likable and funny. Poehler is the less talented of the two but she is the one who does the sight gags and tries to be Lucy or Grace. The movie is really just a feature length sitcom, which is both why it works and why it doesn’t. You can’t go wrong in seeing this but you won’t find any surprises here.