Leonardo Dicaprio, Bradley Cooper, Kim Kardashian and Kanye West were among the stars who helped billionare businessman Jho Low celebrate his 31st birthday at the Wynn Las Vegas on Saturday (03Nov12). Pop star Britney Spears sang a short rendition of Happy Birthday, while other guests included Robert De Niro, Zoe Saldana, Paris Hilton, Swizz Beatz, Jamie Foxx, Busta Rhymes, and South Korean rapper Psy.