Hey all!  Checking in with a quick iHeartRadio Ultimate Pool Party update!

Last night was crazy in Miami!  Here's the lowdown:  For the first time, Tiesto performed his smash "Red Lights" with Tyler Glenn of Neon Trees.  Tiesto was also joined by Matthew Koma (who sang "Wasted") and Tiesto's Hardwell collaboration "Written In Reverse."

Ariana Grande and Iggy Azalea brought it with their own sets, but the Fontainebleau Miami Beach went NUTS when Iggy joined Ariana at the end of the night for their banger "Problem."

Lil Jon, who kicked off the night in crunktastic fashion, was joined on stage by Steve Aoki for their collaboration "Turbulence."

Host Nick Cannon kept the night moving along in fine fashion and was compelled to show the crowd the enormous "Mariah" tattoo on his back.

Oh... and the iHRUPP opening video is not to be missed – Turn Down for Duck!  Check it out here: http://news.iheart.com/poolparty/highlights.html?article=12512137.