Keira Knightley although sent pulses racing at the premiere of her new move ‘Pride and Prejudice’ she was also furious when her ex-boyfriend turned up unannounced at the party.

Knightley who had split from Jamie Dornan last month and is now dating pop star boyfriend Kaz James, was seen without boyfriend at the party.

When quizzed on where her lover was, the brunette star said “My brother is my date tonight.”

An insider says, “Keira had a busy night making sure her tangled romance wasn’t the centre of attention. Kaz was messed about all day. Keira sent him tickets for the film, then got cold feet about him going to the party afterwards. He left the screening and headed straight to her hotel. ”

“It was just as well because Jamie was kicking about too. He is still close to Keira and a confrontation between him and Kaz would have been a huge embarrassment.”