A third sex tape exists featuring the talents of herpes-infected heiress Paris Hilton, a new book claims.

The shocking footage claims to show Paris in a ’state of arousal in the backseat of a New York City taxicab, according to explosive new tome Six Degrees of Paris Hilton by Mark Ebner.

The book is supposed to show how a bunch of shady characters are all connected by their relationship with the her — claims that a guy called Darnell Riley bought 14 hours of video from two “Russian kids” who had stolen it from the socialite’s home.

Six Degrees of Paris Hilton is set to hit shelves next month.

Paris shot to infamy when a sex tape she made with her then-boyfriend Rick Salomon was leaked in 2004.