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.
PHOTOS: How Megan and Brian fell in love
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
Get the scoop on Bradley Bayou's dress design that Oprah wore to the Emmy Awards.
Lea Michele, Megan Fox, and Kate Walsh all get an F on this week's Fashion Offenders.
Jared Leto, Madonna and Jaime King all get an F on this week's Fashion Offenders hosted by Wonderwall's Jessica Wedemeyer.
Miley Cyrus, Katy Perry, and Selena Gomez all get an F on this week's Fashion Offenders.
Get Mariah and Nick's marital woe breakdown on Replay hosted by Wonderwall's Kirby Kristen.
Check out Khloe Kardashian, Kaley Cuoco and more stars who ride horses on today's Celebs Gone Social.
Susan Sarandon dishes on becoming a first-time grandmother and her plans to break her daughter's rules for the baby.
© 2014 Microsoft