Paris Hilton is in a whole lot of trouble.

According to the police report obtained by TMZ, Paris will be charged later today with felony drug possession which carries a punishment anywhere between probation and up to 4 years in jail.

Hilton, 29, was arrested in Las Vegas for possession of a controlled substance on Friday night. Police pulled over an Escalade driven by her boyfriend, nightclub owner Cy Waits, after detecting marijuana coming from the vehicle. When a small container of cocaine was later discovered in Hilton’s purse, she was briefly detained at Clark County Detention Center before being released on bail.

But the cocaine probably would not have been found had Paris not made a monumental mistake. Per the papers filed by the police officer, Paris was trying to roll up window as the officer approached.  As a crowd gathered around the Escalade, Paris told the officer she was “extremely embarrassed” and asked if she could go to the bathroom at the Wynn Hotel. And at the Wynn is when Paris made her big oopsie! Paris told the cop she needed lip balm so the cop handed Paris her purse. The officer says, “As she began to open the [purse], I saw a small bindle of what I believed to be cocaine in a clear baggie begin to fall from the purse and into my hand.” That is how the police found a total of .8 grams of coke in the purse.