Keira Knightley was left embarrassed when no one told her the title of her movie had changed.

The 29-year-old actress was left mortified when she denied being in the movie Say When during interviews, not realising that was the European name for her movie Laggies

The title of the movie had been changed to suit audiences outside America, but no one had told Knightley. She explained: ''I didn't even realise it had had a name change here, it's called Laggies in America because that's a term for people who are being a bit lazy.

"But the guys over here went, 'But in England nobody knows what that is' and they don't it's true, because I didn't know either, so they changed it.

''They didn't tell me until really late so I was doing all these interviews and being asked about this film called Say When and I had no idea what it was and was going, 'I think you've got the wrong person, I wasn't in that.' But I am!''

Say When is in cinemas now – check out our review here.