Cameron Diaz, Matthew Morrison, TheImproper.comCameron Diaz and Matthew Morrison shake and shimmy in a new teaser clip from their movie “What to Expect When You’re Expecting.” Cameron has a baby in the movie and shows she’s got the hips for child birth.

The 34-second teaser touts a fictional dance show, “Celebrity Dance Factor.”

Diaz’s character Jules Baxter, a fitness trainer, and partner Evan vie for the trophy against former The Hills star Whitney Port and basketball player Dwayne Wade.

Black Eyed Peas singer Taboo and UK singer Cheryl Cole also make cameo appearances as contestants.

Diaz’s character falls in love with Evan her professional partner while competing.

Diaz, 39, puts on a show with Morrison, 33, a professional dancer and star on the hit Fox show “Glee.” She wears a racy, red sequined bra and bikini bottom that shows off her toned body and washboard stomach.

Their dance is an explosion of bumps, grinds and gyrations, and hip thrusts. At one point, Morrison tilts Cameron over revealing a major look at her cleavage.

The 34-second trailer looks like a preview for the 15th season of Celebrity Dance Factor. Without knowing the movie’s plot it might throw viewers for a curve.

“What To Expect When You’re Expecting” is an ensemble rom-com based on a book by the same name. It tracks a number of couples as they go through the throes of pregnancy and birth. Jennifer Lopez, Chris Rock, Dennis Quaid, Elizabeth Banks and Chace Crawford are among the co-stars.

Check out the clip below.