Actress Keira Knightley has been visiting London’s Halcyon Gallery lately to pose nude for painter Mitch Griffiths. “It’s considered a great honour to be painted by Mitch,” a source tells The Daily Mail. “He is a highly respected nude painter and is painting a number of subjects for an exhibition next year. He is delighted Keira agreed to take part.” In between her covert trips to Halcyon, however, Knightley is taking the stage in The Misanthrope in the West End. The surprisingly modern twist on Moliere’s 17th-century story, the actress takes on a role she may be familiar with—Hollywood movie star.