Diaz: I Ain't Stealing JT from Jessica Biel

Cameron Diaz may be starring in an upcoming romantic comedy with ex-boyfriend Justin Timberlake -- but she insists JT's current ladyfriend Jessica Biel has nothing to worry about.

Diaz tells Playboy, "We're adults. Of course, we could work together. It’s been three years since we broke up. It's all done ... We're friends; he's really talented and funny, and we're good at being funny together."

According to Us Magazine sources, Justin's decision to take the role beside Diaz "tortured" Biel.

The movie in question -- called "Bad Teacher" -- is scheduled for release next year.

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