Mischa Barton -- Chronic Smoker

Posted May 22nd 2007 2:08PM by TMZ Staff

How does Mischa Barton celebrate making it to Cannes Film Festival?

Well, we're not sure what Mischa's lighting up, but she's no doubt enjoying her time off the French coast ... on designer Roberto Cavalli's yacht. She sure does love those homemade ciggies ...

Perhaps this is what inspired her recent clothing challenge?

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