Emma Watson has taken up pole-dancing.

The 22-year-old actress - who is dating American student Will Adamovicz - decided to take up the raunchy hobby after one of her co-stars on new movie 'The Bling Ring' recommended it for keeping fit.

A source told The Sun newspaper: ''Like on all film sets, there's often so much time spent doing nothing. One of the other actresses on the set has been pole-dancing as a sport for a while and Emma decided to give it a go as well. She's amazed with the results because it has toned up her body so well.

''She never thought she would enjoy it but she finds it quite liberating.''

This isn't the first time Emma has shown interest in the saucy dance. Last summer, following the New York premiere of 'Harry Potter and the Deathly Hallows: Part 2' she partied at a pole-dancing club with pals.

A source said at the time: ''She was really enjoying herself. There were a few scantily-clad girls around but Emma didn't bat an eyelid.

''There are a few poles in the club but she didn't have a go. After such a big night it's no wonder she wanted to let her hair down.

''She had a smile on her face the whole time before calling it a night around 2am.''