Rihanna's Super Bowl concert with Kanye West may rival the halftime show.
Aside from Perry's halftime show and the actual Super Bowl game between the Seattle Seahawks and New England Patriots, Rihanna's invite-only party was the hottest ticket in town, with executives and socialites jostling to get on the relatively intimate guest list.
Rihanna, who will likely be in the stadium to watch friend Perry entertain more than 100 million television viewers, might keep her musical momentum going by surprising the world onstage during the halftime show as another one of Perry's surprise guests.
If not, there's always hope she'll headline next year, especially since she's one of the top-selling female artists ever (only behind Madonna, Mariah Carey, Celine Dion and Whitney Houston).
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