Heir-head Paris Hilton threw the party to end all parties at her Hollywood home for a surprise birthday party in honor of her boyfriend Stavros Niarchos.
The socialite nixed plans to party in Las Vegas, and got a few select friends together at her home to celebrate her Greek boyfriend's 21st birthday. Party-goers included Paris' heir-head sister, Nicky Hilton, moviemaker Brett Ratner and Milla Jovovich, Courtney Love, and Smashing Pumpkins member Billy Corgan.
