Celebrity pictures: Christina Hendricks, Simon Cowell, Katy Perry

Today's celebrity pictures include Pixie Lott in aubergine print and Made In Chelsea's Caggie Dunlop at The Pirates! In An Adventure With Scientists premiere in London.

Also in the capital, Simon Cowell leaves C restaurant in Mayfair and a summery Eliza Doolittle and Diana Vickers attend Emilio Cavallini's Risque Business launch party at Sketch.

Meanwhile, Katy Perry arrives at at Tegel airport in Berlin, and across the pond in New York, Mad Men stars Christina Hendricks and January Jones leave their hotel in Manhattan.

In Los Angeles, Claire Danes and Damien Lewis arrive at a Homeland screening at the Academy of TV Arts and Sciences in Hollywood, Big Bang Theory's Kaley Cuoco attends the 20th annual 'A Night At Sardi's' Fundraiser gala and Mischa Barton dines out.