London, May 8 (IANS) They are not together any more but actress Cameron Diaz didn't find it difficult to work with ex-beau Justin Timberlake in a movie and says both want the other to be happy.

The former couple, who separated in 2007 after dating each other for about four years, have teamed up for "Bad Teacher", reports contactmusic.com.

"We break up. We move on. All I want for him is happiness. And all he wants is my happiness," she told Elle magazine.

"But now, let's make a movie. Let's go have some fun. We're good at being funny together. We know how to do that. That's easy," she added.

Cameron, 38, is now dating baseball player Alex Rodriguez. She doesn't want to live in the past or regret her previous relationships.

"Yes, Alex is my boyfriend. It's not a secret any more. Life is long. Why would you ever live in the past when you can live in the present and allow the future to be bright and happy and exciting. There's no reason.

"I think a lot of people are married to people they're not romantic with any more. I just didn't ever marry anybody that I then had to get divorced from," she added.