The iHeartRadio Music Awards Were Packed with Performances: Check Out the Coolest Photos

Newlywed Grande and collaborator The Weeknd kicked off the show with a sleek performance of their duet, "Save Your Tears."

Smyers and Mooney reminded fans they're "Glad You Exist" during their ethereal performance. 

Bruno Mars and Anderson .Paak brought the sexy with another smooth rendition of their hit "Leave the Door Open."

The Grammy- and Oscar-winner kicked off the tribute to Icon Award winner Elton John with his piano-heavy "Bennie and the Jets."

Carlile hit the stage next with a country-esque rendition of "Don't Let the Sun Go Down on Me."

Lovato wrapped up the tribute with John's "I'm Still Standing."

The pop starlet went sky-high after performing a medley of her hits from an alien-infested cornfield. 

The night's host (and dad-to-be!) brought it back to the early aughts with a mix of his biggest singles that finished with "Yeah!" - and a cameo from Lil Jon.