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Rachel Bilson doesn't have to clean out her closets anytime soon -- someone has already done it for her.
The starlet's home was broken into sometime over the last few weeks -- Rach has been in Canada with fiance Hayden Christensen -- and the thieves totally swiped most of the fashion maven's fancy duds.
"They stole all her designer labels - shoes, clothes, bags ... She collected a lot of vintage shoes - she's a size 5 - and they took them all," a pal said. "All her jewelry, including some handed down to her by her grandmother" was stolen also.
"Fashion is her passion," says Rach's friend. "She's devastated."
Police are investigating the robbery, while Rachel tries to get over it.
"She's shaken," an insider told People.com. "She feels violated."