We know what Katy Perry will be doing the night after the Grammy's, and RadarOnline.com has exclusively obtained a copy of the invitation to the party she will be hosting at the Style Mansion party in Beverly Hills.

Claus Hjelmbak promoter for the swanky event tells us, "I have had an unbelievable response to Katy being involved, especially because everybody is pulling for her to win the Grammy. We have an amazing list of celebrities that will be attending, but that is being kept secret until the big night!"

RadarOnline.com will be at the party and we will give you the inside scoop of all the wild antics!

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