Mischa Barton walks back to her car with her rocker beau Taylor Locke (the guitarist from Rooney) after buying cigarettes at a mobile gas station in Hollywood on Tuesday.

Earlier in the evening, the 22-year-old former O.C. star helped the Nylon Magazine and MySpace celebrate their 3rd Annual Collaborative Music Issue, School Of Rock, with Scarlett Johansson on the cover.

Below is the trailer for Mischa’s latest thriller, Walled In. The film is based on Serge Broselot’s bestselling French novel “Les Emmeures,” about a demolition company rep (Barton) who supervises the razing of a mysterious building and discovers horrifying secrets and past inhabitants entombed within its walls by a vicious murderer.

15+ pictures inside of Mischa Barton & Taylor Locke so in love More Here! »

Mischa Barton and boyfriend Taylor Locke arrive back at their hotel Friday night in London, England.

The pair did a quick wardrobe change and then snuck out the back of the hotel and headed straight for the Met Bar.

Mischa, 22, has been in the planning stages of launching her own collection of handbags. “Mischa has always loved fashion, especially handbags,” her rep told Elle. The line will be vintage-inspired and all finished by a flower motif hand drawn by the ex O.C. star.

WHAT DO YOU THINK about a Mischa Barton handbag collection — YAY or NAY?

40+ pictures of Mischa Barton the fashion designer… More Here! »

Mischa Barton and her boyfriend Taylor Locke storm past photographers with a huge bottle of tequila to their hotel on Wednesday in London, England .

Mischa, 22, was in a bad mood and covered her face to try and avoid being photographed.

The ex-O.C. actress is reportedly set to star in Simon Fellows‘ Malice in Wonderland opposite Danny Dyer. The film will be a creepy adaptation of Lewis Carroll’s Alice in Wonderland with a modern twist.

10+ pictures of Mischa Barton and her tequila tantrum…

Mischa Barton works out a black sexy mini at Britain’s Best 2008 at London Television Studios on Sunday.

The 22-year-old former O.C. star apparently snubbed the premiere of her new movie You and I at the Cannes Film Festival in France.

In You and I, Mischa’s character Lana Starkova is an aspiring model who finds herself dealing with the unsavory side of the fashion industry when she turns up for a casting. Her character is a Russian lesbian who falls in love at a t.A.T.u concert.

According to sources, Mischa thought the film was awful and didn’t want to be involved in the project.

10+ more pics of Mischa ditching ‘You and I’ for Britain’s Best…

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Mischa Barton (in Matthew Williamson) attends the How To Lose Friends And Alienate People party hosted by GQ Magazine, during the 2008 Cannes Film Festival at the Festival House, Villa Khayat in France on Thursday.

Earlier today (Friday), the 22-year-old former O.C. star was seen licking her ice cream cone while walking along the Promenade de la Croisette.

Other pictures include Mischa at the premiere of Blindess on Wednesday at the Cannes Film Festival.

35+ pictures inside of Mischa Barton doing the Cannes Cannes… More Here! »

Mischa Barton arrives at the Nice airport with her pup Ziggy, in France on Tuesday.

Mischa arrived around the same time as Bar Rafaeli, Leo DiCaprio’s model girlfriend, who will both participate in the 61st Cannes Film Festival.

Cannes, the world’s biggest film festival, opens on Wednesday with Blindness, a movie by Brazilian director Fernando Meirelles. It ends on May 25.

Madonna, Angelina Jolie, Gwyneth Paltrow, and Penelope Cruz are all expected to attend the event.

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Mischa Barton attends the ‘Event To Prevent’ Benefit held in NYC on Wednesday to raise awareness of the consequences of teen pregnancy.

Mischa recently responded to magazines publishing unflattering photos of her with cellulite.

“Every woman has cellulite. I’ve never claimed to have a perfect body,” the 22-year-old actress told OK!. “I eat healthy, I work out. I feel very comfortable. I come from a European family that’s always very comfortable with their bodies. You are what you are as a woman. Trust me, there have been some low points in my life where I got really depressed about it, but in general, I find it’s smarter to not get depressed and not feed into it.”

To read the full interview, check out OKMagazine.com.

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Mischa Barton arrives at “Superheroes: Fashion and Fantasy” - Costume Institute Gala at The Metropolitan Museum of Art in New York City on Monday.

Mischa, 22, was accompanied by Margherita Missoni.