Celebrity pictures: Sofia Vergara, January Jones, Barack Obama

Today's celebrity pictures include a beaming Barack Obama hosting a state dinner with First Lady Michelle Obama for Prime Minister David Cameron and wife Samantha Cameron in Washington, and Joe Jonas receives kisses from Victoria's Secret models Chanel Iman and Elsa Hosk at the lingerie label's Pink Nation Spring Break bash.

In Los Angeles, a glamorous January Jones attends Mad Men's season five special screening, a waif-like Kate Bosworth leaves the Screen Actor's Guild offices, and Modern Family stars Ed O'Neill and Sofia Vergara go to an event for the US sitcom as part of PaleyFest 2012.

Meanwhile, Rachel Weisz arrives for her appearance on The Daily Show in New York; and in London, Big Fat Gypsy Wedding stars Danielle Mason and Tony Giles look worse for wear outside Aura nightclub and TOWIE's Gemma Collins leaves the Celebrity Juice studios.