Rihanna is set to guest host Z100's Jingle Ball 2008, set for Friday, December 12 at Madison Square Garden in New York. Tickets for the event — which features performances by Katy Perry, Chris Brown, Leona Lewis, Ne-Yo, Jesse McCartney, Paramore, David Archuleta, Brandy and Lady Gaga — go on sale exclusively to ZVIP members via Ticketmaster on November 10. You can register to be a ZVIP member for free at www.z100.com, keyword: ZVIP. Extra tickets will be available to the public the next day. For each ticket sold via Ticketmaster, $1 will automatically be donated to Stand Up to Cancer — the event’s official charity partner.