James Rainford, Paris Hilton

Jean Baptiste Lacroix/WireImage.com

Paris Hilton isn't taking any chances after the guy who trespassed on her Hollywood Hills house and assaulted her one-time boyfriend showed up uninvited to her Malibu beach house where she hosted a holiday party over the weekend.

Since she's no longer dating her gun-toting boyfriend Cy Waits (who once protected her from yet another intruder, who was wielding knives), she's taken matters into her own hands.

So how is the heiress protecting her famous body and what's it costing her?

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A source close to Hilton confirms she's seriously staffed up her security force, hiring four armed guards and installing a state-of-the art security system.

"My stalker needs to leave me alone. #Creep," she tweeted yesterday about James Rainford, pictured above, who was arrested following the incident this weekend.

She's dropping some major dough to make sure that she's safe. According to a source, the security system was $40,000 to install and the guards cost $80 an hour per person for 24 hours a day, which means she's spending $7,680 a day or $53,670 a week.

Rainford's next hearing has been set for July 15.

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