Emma Watson forms a band!

Emma Watson has formed a band with her The Perks of Being a Wallflower co-stars on set.

22-year-old Harry Potter Emma revealed that she became a musician as well as an on-screen magician during the filming of her new film.

'Throughout the movie [The Perks of Being a Wallflower] we all made music together,' explained the actress. 'Our band was called Octopus Jam.

'I sing and Logan Lerman is a classical composer, and he created a piece for me,' continued Emma. 'Most nights we would sit and play music, so that was fun.'

The Perks of Being a Wallflower hits cinemas nationwide on October 3rd.