parishairlogo.jpgParis Hilton is facing a multi-million dollar lawsuit filed by Hairtech International Inc. who claim the heiress breached her contract by wearing a competitor's fake locks.

The company is suing Hilton, 29, for $35 million in damages, and according to the AP, that's ten times what she was paid to represent the hair extensions. Also included in the lawsuit ... Paris' partying ways going against the company's marketing campaign.

Hairtech International is also upset with Hilton for missing the 2007 launch party for the hair extension line because she was behind bars at the time ... serving twenty-three days for driving twice on a suspended license while on probation for reckless driving. As a result of her absence, the company claims they lost over $6.6 million in revenue.

Calls to Paris' rep have not been returned.