Celebrity pictures: Tulisa, 'The Avengers', Jon Hamm

Today's celebrity pictures include a cleavage-exposing Tulisa Contostavlos attending celebrity agent Jonathan Shalit's birthday party at the V&A along with model Kelly Brook, a lipstick-smeared Lauren Goodger leaves Aura nightclub and Marina Diamandis performs at G-A-Y.

In New York, a bearded Jon Hamm attends the Can-Do Awards Gala, Homeland actress Claire Danes goes for a run, and a pretty-in-pink Dakota Fanning plus Michael Douglas and a glamorous Catherine Zeta Jones attend the 2012 Tribeca Film Festival Vanity Fair party.

Meanwhile in Los Angeles, new mother Charlize Theron pops to a salon, and The Avengers stars Jeremy Renner, Scarlett Johansson, Chris Hemsworth and Robert Downey Jr attend the movie's premiere in Moscow.