Paris Hilton is being sued for allegedly wearing someone else's hair.

A company that manufactures hair extensions claimed the 29-year-old socialite breached her contract to wear and promote their product when she sported the fake locks of a competitor in 2008.

Hairtech International is seeking $35 million in damages - 10 times what she was apparently paid under the contract.

The fraud and breach-of-contract suit cites the heiress' partying as contrary to Hairtech's marketing campaign.

The Los Angeles filing also claims Hilton missed a launch party for the hair extension line because she was serving a stint in jail in 2007.

Hilton served 23 days in 2007 after she was caught driving twice on a suspended licence while on probation for reckless driving.