Keira Knightley has admitted that she was upset she couldn't pick up the dance moves in Anna Karenina.

Knightley, who plays the leading role in the movie explained that she struggled to pick up the elaborate dance routines in the film, while her co-star Aaron Taylor-Johnson had no problems at all.

Speaking to BANG Showbiz, she said: ''I think I'm quite good at picking things up and I found this impossible and Aaron could just do it in about five seconds. It took a really long time.''

However it was not all easy for Aaron, as director Joe Wright revealed he was sick during the shooting of the dance scenes.

Wright said: ''One day when Aaron was actually ill, and there's a bit in the dance when he has a really red face, he was trying not to be sick.''

When asked about the set location he further pitched in: ''I always thought I'd be the kind of filmmaker who dealt predominately with real locations but I find more and more that I like creating spaces in which to play out our dreams. Often there are quite critical limitations put on filming in these locations, so it was interesting.''