Rachel Bilson's Los Angeles home was broken into!

Bilson's designer threads and heirloom jewelry were pilfered from her home while the actress was visiting her fiance, Gayden Christensen, in Canada.

The burglary happened some time in the last few weeks.

Rachel's mom dropped by the house to make sure everything was in order when she noticed her daughter's television, clothing and accessories were missing. There was no sign of forced entry.

Was someone she knows involved???? Someone who knew she'd be out of town?????

"[Rachel's] shaken," a friend of Bilson's shared with reporters. "She feels violated… 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."

How devastating!

The robbers also nabbed "all her jewelry, including some handed down to her by her grandmother."

At least no one was hurt!

But, still. To be violated like that is awful!

[Image via WENN.]