Celebrity pictures: Lily Allen, Jessie J, JLS
Also in London, a glamorous Mischa Barton attends the Women for Women International Gala, and Caroline Flack hops into a cab after leaving The Groucho club.
Across the pond in LA, Katherine Jenkins and her Dancing with the Stars partner Mark Ballas arrive at the Grove to appear on Extra, Josh Brolin attends the Men in Black 3 photocall and in Vegas, JLS and friends take a helicopter ride for Marvin Humes's stag do.
In New York, Rory Culkin attends the screening of Hick, Chloë Moretz arrives for her appearance on The Late Show with David Letterman and in New Orleans, Florence + The Machine - including guitarist Rob Ackroyd, who is rumoured to be dating Katy Perry - perform at the New Orleans Jazz and Heritage Festival.
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