Ariana Grande performed at the iHeartRadio wearing Portia Top ($85.00) and Carlotta Skirt ($125.00) by Rat & Boa, Short Zipper Diamond Earrings ($10,500.00), Atlas Diamond Choker ($55,600.00) and Baguette Diamond Zipper Choker ($118,450.00) all by Anita Ko, with Stuart Weitzman Hollywood Nudist Sandals (Sold Out).