Sienna Miller: 'Flare Path' Gala Preview!

Sienna Miller is all smiles as she celebrates the Gala Preview of her new play, Flare Path, on Thursday (March 10) in London, England.

The 29-year-old actress (in a Twenty8Twelve dress and a Matthew Williamson jacket) posed for pictures with her co-star, Sheridan Smith, at the party.

Sienna recently opened up about her split from on-again-off-again beau Jude Law, saying that the relationship had just run its course and that the two had not gotten engaged again.