Johnny Depp is hot enough for Keira

Johnny Depp

Johnny Depp says kissing Keira Knightley was "awkward" - because she is so much younger than him.

The pair shared a smooch in 'Pirates of the Caribbean: Dead Man's Chest', but Johnny, 43, found it difficult to pucker up to Keira, 22, because of the big age gap between the two stars.

He said in an interview with New magazine: "The smooches are always so awkward, especially because Keira and I have never been in that kind of situation together. She's, like, three and I'm a thousand!

"We've known each other for a few years and suddenly it was, 'Are you ready for this?' And you just do it. It becomes more like a stunt in a way. She was a great sport about it."

Keira has previously revealed she begged director Gore Verbinski to add the kiss between Captain Jack Sparrow and her character Elizabeth Swann.

She said: "I was saying, 'Give me one kiss, just give me one kiss'."

"I got it and it was good, really good."