The singer, model and reality TV star, 32, arrived at Hugh Hefner's Playboy Mansion Halloween bash dressed as the most controversial lady of the moment - Miley Cyrus!
Wearing a replica of Miley's teddy bear outfit from the MTV VMAs - when the singer twerked up against Robin Thicke to worldwide horror - Paris smiled for photographers and playfully posed with her tongue sticking out Miley-style.
Wearing her hair in two cute top knots - just like 'Wrecking Ball' singer Miley - Paris looked like she was enjoying being the young singer for an evening.
Hotel heiress Paris shared the joke with her 12 million Twitter followers, writing: "Twerk or Treat?"
It's been two months since Miley's infamous performance at the MTV VMAs... But Paris clearly hasn't forgotten it!
Other guests at the Halloween party included Paris' boyfriend River Viiperi, who dressed as a sinister undertaker, and Paris' sister Nicky who rocked a nerd outfit.
Do you like Paris' sense of humour? Tell us below!
Watch the video for Paris' new single 'Good Time':