Celebrity pictures: Tulisa, Nicki Minaj, Rihanna

Today's celebrity pictures include Rihanna in a Pucci pyjama-style pantsuit at the world premiere of Battleship in Tokyo, Tulisa Contostavlos arrives for the Chris Moyles Breakfast Show in Central London and Kylie Minogue performs as part of her 'Anti-Tour' at the Hammersmith Apollo.

Also in the capital, Quantum of Solace actress Gemma Arterton attends the Flight BA2012 launch party and a bubbly Demi Lovato signs copies of her new album Unbroken at HMV in Oxford Circus.

In New York, 30 Rock star Tracy Morgan, Ice-T and wife Coco Austin go to Cirque Du Soleil's Michael Jackson: The Immortal World Tour opening night and a blonde Nicki Minaj signs copies of her Pink Friday: Roman Reloaded LP.

And in LA, 90210 actress Shenae Grimes attends the Chinese Laundry Fashion Denim Launch Party and TOWIE's Lauren Pope and Chloe Sims touch down at LAX.