With three awards each, Usher and OutKast were the top winners at tonight's (Sept. 15) 16th annual World Music Awards. Usher opened the show with first single "Yeah!" from his latest LaFace/Zomba set

With three awards each, Usher and OutKast were the top winners at tonight's (Sept. 15) 16th annual World Music Awards.

Usher -- who opened the show with first single "Yeah!" from his latest LaFace/Zomba set "Confessions" -- earned the world's best male artist, best pop male artist and best R&B artist awards.

OutKast took home the world's best group, best pop group and best rap/hip-hop artist honors. Group member Big Boi teamed with R&B veteran Patti LaBelle for a performance of the duo's new single "Ghetto Musick."

Blue Note songstress Norah Jones was another top winner with the world's best female artist and best pop female artist nods.

Celine Dion -- who also performed during the live ABC telecast -- received the Diamond Award in recognition of worldwide sales of more than 100 million albums.

Clive Davis was additionally honored with the "Outstanding Contribution to the Music Industry" award. Davis protégé Whitney Houston performed a special tribute to him with a medley of "I Believe in You and Me" and "I Will Always Love You."

The show was held for the first time at the Thomas & Mack Center in Las Vegas and is scheduled for broadcast in 150 other countries later this month.

Each award is based on sales figures supplied by the International Federation of the Phonographic Industry (IFPI). In Italy and Spain, winners are chosen by the music magazines Musica & Dischi and Showpress, respectively.