Mischa Barton

Mischa Barton arrives for the official opening of the Harrod's 'Summer Sale' at its store in London on June 27, 2009. (AP/Simon Dawson)

Mischa Barton at the official opening of the Harrod's 'Summer Sale' at its store in London on June 27, 2009.  (AP/Simon Dawson)

Just hours before being snapped kissing her singer boyfriend Luke Pritchard, actress Mischa Barton was spotted locking lips with a female pal on her birthday. The star kissed and cuddled her brunette friend outside a Paris nightclub while celebrating her 23rd birthday. (AFP Photo/Gabriel Bouys)

Actress Mischa Barton arrives for the premiere of the film "The Happening" in New York. (Reuters/Lucas Jackson)

Actress Mischa Barton arrives for the Elle-Christian Dior dinner at the Hotel du Cap in Antibes during the 60th Cannes Film Festival. (Reuters/Victor Tonelli)

Actress Mischa Barton of the drama television series "The O.C." poses at the InStyle Warner Bros. Studios party after the 61st annual Golden Globe Awards in Beverly Hills. (Reuters/Fred Greaves)

Mischa Barton exposed a little more than intended while leaving for a fashion show in London. She inadvertently flashed a boob at the taxi driver after popping out of her dress, as she leaned over to open the car door. (Reuters/Fred Prouser)

British actress Mischa Barton smiles as she poses upon arriving at the Festival Palace in Cannes, southern France, for the screening of British director Michael Winterbottom's film 'A Mighty Heart' at the 60th edition of the Cannes Film Festival. (AFP /Francois Guillot)

Actress Mischa Barton from the show "The O.C." arrives at the Fox January 2006 TCA party held at Citizen Smith in Hollywood. (Reuters/Phil McCarten)

Actress Mischa Barton (R) poses at the Weinstein Company Golden Globes after-party in Beverly Hills, California.( Reuters/Mario Anzuoni)

US actress Mischa Barton poses for photographers as she arrives for the screening of Chinese director Johnnie To's film "Election". (AFP/FRANcois Guillot)

Actress Mischa Barton attends the Vanity Fair Oscar Party at Mortons in West Hollywood. (Reuters/Phil McCarten)

British actress Mischa Barton poses upon arriving at the amfAR's (American Foundation for AIDS Research) "Cinema Against AIDS 2007" annual event at Le Moulin de Mougins during the 60th edition of the International Cannes Film Festival in Mougins, southern France. (AFP Photo)

Actress Mischa Barton attends the first ever National Movie Awards at the Royal Festival Hall in London. (Reuters/Luke MacGregor)

Actress Mischa Barton arrives at the Atlantis Gallery in Brick Lane to attend the Elle Style Awards 2006 in London. (AFP/Andrew Stuart)

Actress Mischa Barton insists that her tabloid persona is so different from what she actually is. The actress is adamant that she is not part of the 'fake young Hollywood' set that the media makes her out to be, for in real life, she is "low key and chilled". In the pic, Mischa arrives for the Elle Style Awards at the Atlantis Gallery in London. (Reuters/Eddie Keogh)

I'm so low-key and chilled. But the media has created a fake 'young Hollywood'. It couldn't be further from the truth. I feel so, so different from those girls," Contactmusic quoted her, as saying. In the pic, Mischa arrives at the 57th annual Director's Guild Awards in California. (Reuters/Fred Prouser)

The Brit star added that when she was new to LA she knew nothing about the industry, and that she had to make mistakes to learn a few things. In the pic, Barton poses at the annual Primetime Emmy Awards in Los Angeles. (Reuters/Mike Blake)

Mischa further added, " I'm a private person, you won't find more than four or five true friends around me, ever," In the pic, Mischa arrives at the BAFTA awards in London. (Reuters/Stephen Hird)