Celebrity pictures: Tulisa, Nicki Minaj, Rihanna
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.
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