Katy Perry was among many celebrities partying Friday night at the Mirage in Las Vegas.  The casino was celebrating the grand opening kick-off weekend of its new club, 1 OAK, with a party sponsored by J. Molinari jewelry.   Katy was on hand to help her BFF, designer Markus Molinari host the shindig.

And since you’ve got a bunch of folks with money together in one room, why not raise some money for a good cause while you’re at it?  The event was also a benefit for GiveLove, an organization founded by Rosetta Getty and Patricia Arquette.  GiveLove supports the development of community-led sanitation projects in Haiti.   A very worthy (and necessary) cause!

This was Katy’s first red carpet appearance since the news broke about her divorce from Russell Brand.  She sure doesn’t look like she’s letting that bring her down!   Get more pictures after the jump.

[ Images by Judy Eddy/WENN.com ]

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