Miley Cyrus' burglary is believed to be an inside job.

The 'Wrecking Ball' hitmaker was shaken up after an intruder got into her house on her birthday last month and stole around $100,000 worth of jewelry.

She wasn't in the house at the time but - according to TMZ - police believe the culprit may be someone she knows.

The gossip website explained surveillance footage doesn't show anyone suspicious entering or leaving her Studio City home - plus there is no sign of forced entry.

Police are now looking at a number of workers who were at the house while she was away.

Miley will have been glad to not be at home when the intruder got in, but - while she might be scared of being burgled - it seems she thinks some celebrities are actually scared of her risque reputation.

Speaking to the New York Times newspaper, she said: ''You don't have to be signed to Disney Channel to be put in a box, or to be rated PG.

''I'm with artists sometimes, and I'll take a picture of them or whatever. They make me delete it ... I don't have a bunch of celeb friends, because I feel like some of them are a little scared of the association. This is terrible.''