Cyrus, 19, put on heavy eye lashes, multi-coloured nail polish and leopard print and donned Minaj's signature pink lipstick at Sunset Boulevard, Oct 30, reports contactmusic.com.
Her actor fiance Liam Hemsworth dressed up like a unicorn.
Actor Zac Efron also attended the bash dressed up like a cowboy.
In Pictures: Sex scandals involving Indian politicians
Photos: Sports stars who shocked the world with their retirement
Photos: Abhishek Bachchan and Farah Khan at Boman Irani's birthday bash
Spotted: Shah Rukh Khan at Morani's bungalow in Mumbai
Spotted: Sonam Kapoor and sister Rhea at Mumbai airport