See Shakira, Christina Aguilera, the DWTS gang and more hanging out at the SoCal music fest
Credit: John Shearer for PEOPLE.com
Updated: Monday May 12, 2014 | 01:00 PM EDT
By: Brooke Showell
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The host with the most! Ryan Seacrest is poised to greet performers like Ariana Grande and Adam Levine backstage at the show. "Crowd is amped," he posted to Instagram of the all-day action.
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