Cameron Diaz & Justin Timberlake's "Clear Boundaries" Made 'Bad Teacher' Less Awkard

Even though Cameron Diaz and Justin Timberlake are exes, Cameron insists it was not at all awkward filming Bad Teacher together.

OK! VIDEO: WATCH CAMERON DIAZ, JUSTIN TIMBERLAKE & JASON SEGEL JOKE AROUND FOR BAD TEACHER

"You guys, of course, went out for awhile," Robin Roberts said on Good Morning America. "So what was it like working together?"

"It's great," Cameron said. "You know, Justin and I are great friends. We love each other. We want the best things for one another. We've always been able to laugh together and so to do a comedy together was  — to make movies is a blessing. It really is a privilege and it's not lost on either one of us — so we had the opportunity to do it together. He's so talented and so funny. And so we just laughed the whole time and we had a great time."

"You said it was less awkward doing the movie because you all knew each other so well," Robin added.

"Because the boundaries are clear," Cameron explained. "If it's somebody you don't know you're kind of going like 'Hmm. Maybe.' But you know 'no' in this instance."

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Watch the interview, below!