Wearing a sexy, sheer black number from Givenchy, RiRi picked up awards for Artist of the Year, Song of the Year and Best Fan Army.
Pharrell Williams and his new “Voice” coach co-hort Gwen Stefani made an appearance, and Pharrell won the Innovator Award. He also performed a medley of his hits, including "Get Lucky" and "Happy."
Billy Ray Cyrus was on hand to accept the Best Lyrics award on behalf of his ailing daughter, Miley, who won for "Wrecking Ball."
Other performers included Pitbull, Shakira, Ariana Grande, Ed Sheeran, Bastille, Blake Shelton, 30 Seconds to Mars and Luke Bryan.
Check out "Extra's" coverage at the event with special correspondent Susie Castillo. Castillo also talked to Austin Mahone who told us his dream date would be dinner with Rihanna!
For a complete list of winners, click here!
Superstar Rihanna was the big winner at the first annual fan-voted iHeartRadio Music Awards on Thursday.