Megan Fox: Bra & Undies for 'This is 40' Trailer!

Megan Fox strips down to her bra and undies in the latest trailer for Judd Apatow‘s This Is 40!

The sequel to the hit movie Knocked Up also stars Paul Rudd, Leslie Mann, Jason Segel, and Chris O’Dowd.

PHOTOS: Check out the latest pics of Megan Fox

The flick fast forwards a few years into the lives of Pete (Rudd) and Debbie (Mann), and shows how they deal with their states as they grow older.

Look out for This Is 40 when it hits theaters on December 21!