Cooper leaves Zellweger red-faced on TV show

The couple met on the set of movie thriller Case 39 in 2006 but have largely kept the details of their relationship quiet.

But when Cooper filmed an appearance on Inside The Actors Studio, he couldn't resist name-checking his partner.

Host James Lipton mentioned that an "enchanting and gifted actress" was in the crowd, prompting The Hangover star to point at the blonde and say "Renee Zellweger".

The actress, who was sat next to Cooper's mother Gloria, stood up and waved as the audience applauded.