Scenes From the iHeartRadio Ultimate Pool Party: J.Lo's Knee Boo-Boo, Ariana & Iggy's Boogie

Nick Cannon led a sweaty crowd through two sweltering Miami nights at the iHeartRadio Ultimate Pool Party this weekend at the Fontainebleau Hotel, featuring performances from Jennifer Lopez, Ariana Grande, Iggy Azalea, Lil Jon, Neon Trees, Magic!, and Tiësto. If you missed all the DJ cameos and crunk dances during Yahoo Screen's livestream, here were the biggest moments of the splashy soiree.