Rihanna swept the first ever iHeartRadio Awards in Los Angeles, in a low-key show that gave fan favorites on the radio their proper due. The Barbadian singer appeared in a lacy see-through dress to accept her four prizes, including song of the year for "Stay," hip-hop/R&B song of the year for "Pour It Up," best fan army for her so-called "Navy" of fans, and the biggest prize of the night, artist of the year.

Other big winners included Miami rapper Pitbull, who won for best collaboration with Kesha on the song "Timber," and Pharrell Williams, who picked up the "Innovator" award.

Also debuting at the awards show was a new single from Michael Jackson. Usher danced to the tune, called "Love Never Felt So Good" - which was originally written and recorded by Jackson in 1983. The song will be part of a posthumous album which debuts on May 13 and will include eight previously unreleased songs that Jackson recorded between 1983 and 1999.

Britain's Prince William and Prince