The ban comes after several Las Vegas insiders claimed that the heiress might be blackballed from nightclubs. After the car in which she was riding was stopped, Hilton, 29, was taken inside the Wynn, where it was allegedly discovered that she had cocaine in her purse.
Coinciding with the ban, Wynn Las Vegas also announced in a vague statement that Hilton's boyfriend, nightclub executive Cy Waits, has been "separated from the company and is free to pursue other interests." No further comment or details was provided.
Waits, 34, was stopped by police officers Friday night when they smelled marijuana wafting from the car window. According to a Waits's arrest report, also released Wednesday, he failed a sobriety test.
Charges have yet to be filed against Waits, the Clark County Attorney's office said. Just days before his arrest, Waits was recently promoted to Co-Chief of Nightlife Operations at Wynn Las Vegas and Encore.
Hilton and Waits have been dating since June.