Pictures of Keira Knightley in London Post Break Up With Rupert Friend

Keira Knightley smiled for photos last night as she left London's Comedy Theatre following a preview of The Children's Hour, in which she stars opposite Mad Men's Elisabeth Moss. The show officially opens on Feb. 9, and it marks Keira's return to the stage following her 2009 run in The Misanthrope. The actress is busying herself with acting after her split from long-term boyfriend Rupert Friend, as she's also made time for girlfriends by spending a big evening out with Sienna Miller. Keira's apparently lining up more big-screen work too, as she's rumored to be replacing pregnant Marion Cotillard in her fellow Brit Robert Pattinson's Cosmopolis.