One Informative Caption tells me that this is Carey Mulligan at “the War Child Winter Wassail,” which is in aid of a charity she works with, War Child, which protects and helps children affected by war. The other Informative Caption told me she was attending the launch of a luxury shoe brand owned by Will.i.am, and his brother Gilliam, who surely has heard the “Gill.i.am???” joke every day of his life. Go home, Informative Caption #2, you are drunk.
I, however, am totally sober, and therefore feel completely justified in noting that, wherever she is, she looks GREAT.