Cooper 'learns a lot from Zellweger'

Bradley Cooper has praised girlfriend Renee Zellweger for her performance on the set of Case 39.

The couple - who were recently rumoured to be getting married - worked together for the first time in the thriller.

"I can't say enough about her," he told Entertainment Tonight.

"I just love her. I [loved] coming to work. I love acting with her. I can learn so much from her."

Zellweger returned the compliments, saying: "[Bradley]'s a great, great actor. I just got so excited, not believing that I was going to go to work with him."

Case 39 opens October 1 in the US.