Sienna Miller was in high spirits as she left London's Theatre Royal Haymarket after last night's performance of Flare Path. Her daily departures from the show offer a chance to show off her favorite trends from sailor stripes to neon accessories, and yesterday was no exception with her flirty floral dress. Sienna's best accessory, however, has been her new love interest, pal Tom Sturridge. The pair have tried to keep their relationship under wraps but have still been spotted enjoying private dinners and late evenings at their favorite pubs. Tom's best friend, Robert Pattinson, is currently touring the states ahead of the Friday release of Water For Elephants, divulging stories from the cross-country road trip the two guys took late last year. Tom will soon make the talk-show rounds as well when he and Kristen Stewart begin promoting their Fall release On the Road.