Mischa Barton's Late Night in London

London-born actress Mischa Barton wears a black and white pleated ruffled dress as she enjoys a late night dinner out in London on Thursday with a few friends.

Before being chauffeured back to her hotel, the former O.C. starlet stayed hydrated, chugging down some Evian water.

UPDATE :: Added pictures of Mischa Barton on Friday afternoon at the Schuh store on Oxford Street for another meet and greet as the brand ambassador for Keds shoes.