The `House Bunny` actress - the daughter or Bruce Willis and Demi Moore - had more than $10,000 worth of items stolen, including construction tools, after the burglar entered her Hollywood Hills home by slicing through a gate lock with a blowtorch-type device, law enforcement officials told TMZ.com.
Nobody was injured during the raid and no-one was in at the time of the burglary as Rumer`s home is currently unoccupied.
The incident caps a torrid few weeks for Rumer after she was said to be finding her mother Demi`s recently troubles "tough", following the `Striptease` actress` hospitalisation late last month after she suffered a seizure at a party.
Rumer`s friend Zac Efron explained: "It`s tough, but I think she`s all right.
"Me and Rumer have been friends for a long time. I know Demi is going through some personal stuff right now. I just wish her well. I hope she`s doing OK."
Demi - who is rumoured to have gone to rehab for "eating disorder and addiction issues" - was recently said to be seeking advice from Michael Jackson`s former spiritual guru Deepka Chopra in the wake of her hospitalisation.