- Patricia Arquette, David Arquette and Christina McLarty at 1 OAK.
- Paris Hilton and Nicky Hilton arrive at the grand opening of 1 OAK.
- Singer Christina Millian attends the grand opening celebration at 1 OAK.
- Maksim Chmerkovskiy, left, and Val Chmerkovskiy attend the grand opening celebration at 1 OAK.
- Paris Hilton parties at 1 OAK.
- Markus Molinari and Katy Perry at 1 OAK.
- Mike Heller, left, and Scott Disick at 1 OAK.
Over the weekend a motley crew of NYC and LA's finest — Katy Perry, Scott Disick, Chris Evans, Christina Milian, Shenae Grimes, Michelle Trachtenberg, Paris and Nicky Hilton, David Arquette — descended on the City of Sin to celebrate the grand opening weekend of Mirage's newest import, 1 OAK. What did you miss? Ubiquitous glow sticks, bottles with sparklers, "snow," and the expected underfed models clustering around club owners Richie Akiva and Scott Sartiano's table two nights in a row. Oh yes, and Bob Saget chose to attend as well (he didn't get IDed upon entry). Rumor had it that Katy Perry was supposed to perform on Friday night, unfortunately that never happened — but DJ Jesse Marco showed up Saturday night to save the day. —Kat Odell