Making a promotional appearance in London, Mischa Barton stepped out for the launch of Harrods annual summer sale on Saturday (June 27).

Joined by the store's boss, Mohamed al-Fayed, the former "OC" starlet was decked out in a white micro mini dress as she took part in the day's festivities.

Aside from her Harrods duties, Miss Barton has recently been busy filming a pilot episode of the Ashton Kutcher produced show, "A Beautiful Life".

Co-starring Corbin Bleu and Elle Macpherson, the new TV program makes its big premiere on The CW on September 16 at 9PM ET/PT.

Celebrity Gossip

Enjoy the pictures of Mischa Barton kicking off Harrods summer sale (June 27).