British beauty Keira Knightley has revealed that she is still star struck and gets tongue tied when she meets other stars.

"George Clooney produced my latest film, The Jacket, and he was only there for one day. I think I managed to say hello and goodbye," she was quoted by B magazine as saying.

The Pirates Of The Caribbean star also gets very nervous while wearing expensive jewellery to a premiere.

"I have to tell myself 'This cost a tenner in Topshop,' otherwise I freak out," she said.