Sienna Miller was ready to party last night at a bash celebrating her latest West End production, Flare Path. She's spending most of her evenings at the theater rehearsing, though she's got time afterward to pub hop with Tom Sturridge. Sienna was quick to move on after splitting with Jude Law last month, and she recently shared some personal details of their breakup. Tom's one of the hottest young British actors working right now, and it doesn't hurt that he's best friends with Robert Pattinson! Tom is headed to the big screen later this year opposite another Twilight star, Kristen Stewart, in their Jack Kerouac classic On the Road.