Cameron Diaz wasn't worried about working with Justin Timberlake!

Cameron Diaz insists she and Justin Timberlake had “no concern” over whether or not they could work together despite their romantic past.

The former couple star together in upcoming movie Bad Teacher and Cameron who’s currently romancing baseball hunk Alex Rodriguez says her relationship with Justin is now strictly professional.

“We had no concern whether or not we would be able to work with each other, we knew we would,” Diaz said.

“We were there to work and to make a really great movie. We had fun.”

Diaz recently called Timberlake “weird”.

“Justin and I have always had a good laugh together, and to make a movie where we get to have a laugh together, and there really was no one else who was more perfect for this part,” Cameron said. “Justin is a genius comedian.

“We went for the best person for the job, and it just so happened that it was him. And he delivers. He’s frickin’ weird in movies. He’s so bizarre and hilarious. I say that with great respect to his character and what he’s done!”