Megan Fox strips off to just her bra and underwear in new This Is 40 movie trailer - OK! Magazine

#xa; Transformers star showed off her cleavage and flat tummy in the promo alongside Leslie Mann in the Knocked Up spin-off

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Megan Fox strips down to her bra and underwear in trailer for Judd Apatow's This Is 40

Megan Fox – This is 40 Underwear Stills

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Megan Fox: Bra & Undies for 'This is 40′ Trailer!, Chris O'Dowd, Jason Segel, Leslie Mann, Megan Fox, Paul Rudd

Attempting To Seduce Megan Fox, This Is 40 (2012)

Megan Fox Strips Down to Bra, Underwear in This Is 40 Trailer

This Is 40 Exclusive Clip - Megan Fox, Paul Rudd, Leslie Mann

Megan Fox strips down, gets fondled in This Is 40 - 9Celebrity