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Sex Tape, Jason Segel, Cameron Diaz

Claire Fogler/Columbia Pictures

Cameron Diaz and Jason Segel's Sex Tape looks pretty entertaining, huh?

The twosome are costars in the upcoming movie—like, real movie, not a home movie—about a couple whose personal porno has gone missing.  As you can see from this tease-y Sex Tape snap, their characters aren't afraid to be adventurous—even when that involved roller skates in the bedroom!

This isn't the first time Cameron, 41, and Jason, 34, have shared some onscreen chemistry. They worked together in 2011's Bad Teacher, and Jake Kasdan is directing them once again in Sex Tape.

But if something looks different about these two in Sex Tape vs. Bad Teacher, your eyes are not deceiving you. Cameron, author of The Body Book, is always a picture of health and in tiptop shape. But Jason, who is lovable and cute at any size, slimmed down quite a bit for his role in the comedy.

So how did the How I Met Your Mother hunk drop the weight? "I've just been living healthy, exercising, eating right—no more midnight pizzas," he told Us Weekly back in August. "This time when I take my shirt off, I've made a promise to myself, it doesn't have to be funny."

"[Sex Tape] is R-rated," he said, adding, "I'm not in shape for no reason."

Bow-chicka-bow-wow. Sex Tape hits theaters July 25.