Keira Knightley finds Benedict Cumberbatch's fans terrifying

She said: "The Cumberbitches. It's terrifying. "I mean, they're lovely. I feel terrified saying they're terrifying cause they might come after me. So... yes, it's amazing! They're very artistic! They paint pictures of him.

"You go to premieres and there's these amazing paintings of Ben looking Ben-like... [They're] a very hysterical, artistic type."

The 'Begin Again' actress - who first worked with the 38-year-old hunk on 'Atonement' in 2007 - was left red-faced when she was urged to sign autographs for Benedict's fans at the UK premiere of 'The Imitation Game'.

Speaking to 'Late Night' host Seth Meyers, she recalled: "I actually had a really embarrassing moment at the London premiere, because - they really do - they scream more than I've ever heard for anyone else, but I had a publicist with me and she went, 'You know, go sign some autographs.'

"I went over there and went, 'Oh yeah, of course, of course, no problem!' And they were like, 'Oh no, we don't want you. We're just here for Ben.' "