Megan Fox is taking it off in her return to the big screen.
The 26-year-old actress, who is currently expecting her first child with husband Brian Austin Green, stars This Is 40, which is Judd Apatow's sequel to Knocked Up the 2007 hit film, Knocked Up.
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This Is 40 takes a look at how Paul Rudd (Pete) and Leslie Mann (Debbie) marriage has changed over the years as they approach turning 40.
The latest trailer highlights new cast members Jason Segel, Melissa McCarthy, Chris O'Dowd and Fox -- who steals the show with a strip tease.
PHOTOS: Megan's incredible body through the years
Fox stars as the young, hot Desi, who Debbie envies while shopping in a store.
"Are those real?" a mesmerized Debbie asks while reaching out and trying to touch Fox's chest.
PHOTOS: Angelina Jolie vs. Megan Fox
"Yeah," Desi replies as she's standing in the middle of the store wearing a hot pink bra and animal-print underwear. "I'm just young."
This Is 40 opens in theaters Dec. 21.
This article originally appeared on Usmagazine.com: Megan Fox Strips Down to Bra, Underwear in This Is 40 Trailer
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