Megan Fox (Photo : Reuters)

Megan Fox strips down to her bra and underwear as she makes a return to the big screen with upcoming film "This is 40."

Expecting her first child with husband Brian Austin Green and making a comeback to the big screen, Megan Fox will play the role of the young, hot Desi in "This is 40," Judd Apatow's sequel to the 2007 hit film, "Knocked Up." A trailer from the movie shows pregnant Fox stripping to her bra and underwear for one of the scenes.

"This is not just their story," says the tagline in the new trailer for "This is 40." Fox manages to steal the show with her little strip tease. News about Fox's pregnancy was spread all over the Internet in April when Radar Online first reported it.

"They just found out and are incredibly excited," Radar Online quoted a source confirming the news. "Megan has become a great stepmom, and Brian knows she'll be wonderful with the baby."

Make-up pro Shannon Grey Williams is the lady in charge of Fox' signature sexy style and has revealed how she achieves the star's ever-pretty peepers.

"For a wide-eyed look, I applied Ardell Individual Lashes to the corner of her eyes," she said. "This opens them up without looking heavy. For definition, I swept black liquid liner along the lash line and added a coat of Dior DiorShow Backstage Makeup Mascara in black to her top lashes.

"Megan has great brows so rather than change the shape of their natural arch, I enhanced them with Mac Eye Brows in Spiked, filling in the outer edge of the brow and following her natural shape."

For foundation:

"Megan has clear skin, so there was no need to use a heavy foundation," she revealed to Fabulous magazine, before adding: "For a natural-looking flush, I used Mac Casual Colour in Weekend Getaway. I applied it with my fingers to the apples of her cheeks, blending it gently where she would naturally blush."

Check out the trailer:

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