16 Photos You Need to See from the iHeartRadio Festival

What happened in Vegas this weekend didn't stay there! See how Taylor, Ariana, Alicia, Usher and more celebrated in Sin City

TWO CUTE

Aww! Usher rubs the baby bump of a smiling Alicia Keys while taking five. “[I have] a lot of love around me and a lot of good energy around me," Keys told radio host Elvis Duran of her second pregnancy backstage. "Strong family makes everything a lot easier!”