Sienna Miler Glams Up for Dave

Sienna Miller looks fabulous out on a cold day in New York City as she heads inside for The Late Show with David Letterman on Tuesday (October 13).

The 27-year-old British beauty is in NYC to promote her new Broadway play, After Miss Julie.

The G.I. Joe actress reportedly bumped into her ex-fiance, Jude Law, at a recent party thrown by mutual friend Jonny Lee Miller.

10+ pictures inside of Sienna Miller glamming up for David Letterman…