She's having her baby

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Judd Apatow's "40 Year-Old Virgin" wasn't just the best comedy of 2005. Along with "The Wedding Crashers," it redefined the R-rated comedy as a date movie: plenty of low-brow, frat-house antics for him, ultimately redeemed by a sweetly reassuring, love-conquers-all message for her.

Mr. Apatow's "Knocked Up" repeats -- with refinements of its own -- the successful formula.

"Grey's Anatomy's" Katherine Heigl plays Alison, a young production assistant at E! Entertainment who dreams of an on-camera role. She earns that very promotion at the cable outlet, minutes after Ryan Seacrest deftly punctures his own image in a winning cameo.

Alison celebrates her good news with her married sister Debbie (Leslie Mann) at a trendy night club. A few drinks later, she meets Ben (Seth Rogen), a likable lug who spends his days toking up with his roommates and creating a soft-porn Web site.

Improbably, the two hit it off, and they end up together for a night of inebriated passion.

The next day they go their separate ways, seemingly for good since they have nothing in common beside a hangover.

A few weeks later, Alison starts getting sick at work and realizes she is, gulp, pregnant. She invites Ben to dinner to break the news. He can't believe it. She quickly dismisses thoughts of aborting the baby, a point not belabored here.

They may be polar opposites, but they realize they need each other for the baby's sake. In scenes that manage to be both refreshing and real, they start getting to know each other, and slowly a romantic flame flickers.

Debbie's strained marriage to Pete (Paul Rudd, the hardest working man in comedy and perhaps the least appreciated) makes Alison and Ben's bonding experiment even harder.

All the while, Ben looks for wisdom from his ne'er-do-well friends -- who collectively are almost as funny as the troupe from "Virgin" -- and his father (director Harold Ramis in an avuncular cameo).