Paris and Nicky Hilton. (Courtesy Photo: WireImage)

Southampton - On Friday, January 27, Katy Perry co-hosted the GiveLove charity event with J. Molinari Jewelry designers Markus Molinari and Jason Arasheben during the Grand Opening weekend of 1 OAK Las Vegas at The Mirage, Sin City's newest hot spot. The "Waking Up In Vegas" singer, along with Markus and Jason, presented a check to the charity's co-founders, Patricia Arquette and Rosetta Getty, as well as board member David Arquette before heading inside the party to join the 1 OAK owners, Richie Akiva and Scott Sartiano as well as 1 OAK Las Vegas managing partner Eli Pacino.

As Katy enjoyed a few cocktails and hung with friends at her VIP table, DJ Mia Moretti and violinist Caitlin Moe took over the DJ booth for a one-of-a kind performance! The duo was followed by a special live performance by Jordanian-American pop singer Ferras. The night was a memorable one for all and it benefited the GiveLove charity, which develops temporary housing solutions and improved sanitation systems in Haiti.

Guests included Paris and Nicky Hilton, Christina McLarty, Balthazar Getty, Scott Disick, Chris Evans, Christina Milian, Shenae Grimes, Michelle Trachtenberg, and others.