Cameron Diaz is "thrilled" to be starring alongside ex-boyfriend Justin Timberlake in new movie, because she enjoys the singer's on-set antics.

In 'Bad Teacher', the 'Charlie's Angels' actress stars as a junior high school teacher who sets out to steal a colleague's boyfriend, played by Timberlake, in the comedy.

Diaz and Timberlake dated for almost four years, before splitting in 2007, and since then the singer has found love with actress Jessica Biel.

But 'The Holiday' star is excited to have Justin play her love interest in the film, which also stars Molly Shannon and Jason Segel.

"We're thrilled to have him. He's the best person for the job. He's going to be hilarious. He's clearly a very talented comedian, look at his Saturday Night Live (skits). He's fantastic, he's going to be so great," the Daily Star quoted her as telling Access Hollywood's Billy Bush.

"We just had our first day of shooting yesterday with Jason. And we just laughed all day. It's so wonderful, I'm so excited," she added. (ANI)