The actress and reality TV star was dreaming of a vacation gone by when she posted a bikini-clad snapshot.
Posing in a black two-piece swimsuit and white jacket, Mischa threw her head back as the sun shone down on her.
She was holding a drink in a wine glass and had her eyes shut as she leaned against the railings of the boat.
Mischa lives in Los Angeles but was born in the UK. She found superstardom as Marissa Cooper on the teen series The O.C.
Last year, Mischa revealed details of her departure from the hit show.
The star said that "general bullying from some of the men on set" had a big impact on her decision to leave.
"I've always felt ashamed in a way to really talk about what went on behind the scenes because I've always been a very private person and very aware of people's feelings," she said.
"Now that we're living in this era where we do speak out about our experiences and women do come clean about what was really going on behind the scenes and how they were treated, it's a slightly different thing."
Mischa admitted that the situation was complicated but said that ultimately, "evening out everybody's pay—and sort of general bullying from some of the men on set that kind of felt real [expletive]."
She previously fell foul of the pitfalls of fame in her twenties and suffered a public breakdown.
Mischa Barton said that if she were asked to do it all over again she would "probably not".
"It's tough. It's really tough when you are young in this business,' she said. "People blow a lot of hot air at you. That’s the main thing. Keep your head on your shoulders - even when you think your head is on your shoulders, sometimes it isn't!"
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