Emma Watson isn't worried about Matthew Janney's reputation as a ladies man.

The 'Harry Potter' actress has started dating the rugby-playing British hunk since splitting with long term boyfriend Will Adamowicz, and is ignoring her friends' warnings that he is could break her heart.

A source told America's Star magazine: ''They had instant chemistry. People have warned Emma about his past, but she doesn't care. She became infatuated with him immediately, and he loves her attention.''

The couple were spotted kissing on a romantic break in the Caribbean earlier this month, and Coralie Day -Matthew's guardian, who has looked after him since the death of both his mother and father from cancer, leaving him orphaned at 16 - says she's ''thrilled'' for them both.

She has said: ''We are thrilled to bits that he is seeing Emma Watson. We are looking forward to meeting her soon.

''Hats off to her for finding such a wonderful young man. There is nothing bad anyone could say about Matt. He is absolutely lovely.''