Sienna Miller: Lonely in London?

Fresh from her steamy vacation with married man Balthazar Getty, a solo Sienna Miller looks a bit down as she hides her face while out and about in London on Monday.

Sienna‘s much-publicized affair with the 33-year-old Brothers & Sisters star (and heir to a $50 billion oil fortune) prompted his fashion designer wife Rosetta, 37, to flee the country. She said she felt “humiliated” by his behavior.

10+ pictures inside of Sienna Miller looking lonely in London…