Smith gives London movie-goers a treat

Will Smith surprised fans at the London premiere of his latest film I Robot, by putting on an impromptu concert.

The 35-year-old star, accompanied by DJ Jazzy Jeff, sang hits including Men In Black and Summertime on a temporary stage in London's Leicester Square. He also performed his new single Switch, which appears on the I Robot soundtrack.

The actor/rapper is due to release a new album later this year.