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If Baby Mama were a more (stereo)typical Holly-com, it would star, say, Cameron Diaz and Amanda Peet and it would be rubbish. Much falling over, mugging to camera and long-in-the-tooth cuteness would occur, but you’d be hard pushed to summon more than a guffaw.

Instead, with producer and Saturday Night Live creator Lorne Michaels casting two of his most talented finds – Tina Fey (whose award-winning sitcom 30 Rock he exec-produces) and Blades Of Glory’s Amy Poehler – in a script by SNL alumnus Michael McCullers (who co-wrote the last two Austin Powers movies), Baby Mama rises comfortably above formula foundations.

And it’s not just the leads who succeed; Steve Martin getting effortless laughs as Barry, the ecologist heading up the green grocery chain where Fey’s career-girl Kate works. Promoted to vice president (and rewarded with “five minutes uninterrupted eye contact” with ponytailed, sock-free Barry), Kate celebrates with a trip to the sperm bank but, alas, her womb is unwelcoming (“I just don’t like your uterus,” sighs the specialist) and a foetus not forthcoming.

Instead, she drops $100,000 at a surrogacy centre, where she notes, “It costs more to have someone born than it does to have someone killed!”

She’s paired with Poehler’s pregnant white-trashy Angie – who promptly splits from oaf boyfriend Dax Shepard and moves in. Cue odd-couple antics (peeing in sinks, Singstar sessions, farting in handbags...), refreshed by the chemistry between the long-time colleagues, a sweet subplot with the always excellent Greg Kinnear’s dreamy smoothie-seller and a twist to the nine-months blitz, which we won’t reveal here.

It’s not faultless – McCullers cranks out zingers but doesn’t distinguish himself as a director, the score (penned by Fey’s composer husband, Jeff Richmond) is über-schmaltzy and it all goes a bit Parenthood at the end – but it is very funny. A bundle of joy, to be crass.

Using the same science behind the success of Will Ferrell and Steve Carell - cast a comedian in a comedy... et voila - Baby Mama emerges as more than just another pregnancy flick. Not an immaculate conception, but several belly laughs.

The Total Film team are made up of the finest minds in all of film journalism. They are: Editor Jane Crowther, Deputy Editor Matt Maytum, Reviews Ed Matthew Leyland, News Editor Jordan Farley, and Online Editor Emily Murray. Expect exclusive news, reviews, features, and more from the team behind the smarter movie magazine.