UPDATE 2 Paris has been officially charged (READ).
UPDATE: Paris is saying it was her girlfriend's coke
Paris is telling friends, "It could be a setup. Everyone knows how against cocaine I am."
Paris Hilton has been arrested on suspicion of possessing cocaine.
The socialite was detained by police in Las Vegas on Friday night after they pulled over a car in which she was a passenger.
Cops are said to have found a suspicious-looking white powder in Hilton's purse, which was tested and allegedly proved to be cocaine.
The hotel heiress was arrested and booked into the Clark County Detention Center, where she was charged with possession of a controlled substance.
Hilton has been released on her own recognizance, according to TMZ.com.
Updated TMZ Link: SHE'S SAYING IT WASN'T HER PURSE!!!!