Pop trio The Jonas Brothers are preparing for an unusual London launch for their new album - they're to play a free gig on the roof of one of the city's famous red buses.

The teen stars will put on the special performance on the upper deck of an open-top bus in central London on June 27th.

Their album A Little Bit Longer, which hit U.S. stores last August, is their third studio release - but will be their first in the U.K.