Iggy Azalea and Ariana Grande

Iggy Azalea and Ariana Grande took to the stage at the MGM Grand Arena in Las Vegas to perform their hit singles "Fancy" and "Problem," respectively.
Iggy Azalea and Ariana Grande took to the stage at the MGM Grand Arena in Las Vegas to perform their hit singles "Fancy" and "Problem," respectively.
Lorde took home the awards for top rock song for "Royals" and also was named top new artist.
The rapper-actor hosted the awards show, which aired live on ABC.
Pitbull and Jennifer Lopez kicked off the awards show with the premiere of the official anthem of this year’s FIFA World Cup, "We Are One (Ole Ola)."
Imagine Dragons, fronted by Dan Reynolds, performed during the show and also won top rock album for Night Visions.
The Voice coach performed her new single "Empire" at the awards show.
Ricky Martin performed "Vida," the 2014 FIFA World Cup theme song, to the Las Vegas crowd
OneRepublic performed the hit single "Counting Stars."
The country singers debuted their new duet "Somethin' Bad," which is from Lambert's upcoming album Platinum, due out June 3.
The Icon Award recipient took to the stage twice Sunday night, once with Pitbull and another for a solo performance of "First Love."
The country singer won the Milestone Award at Sunday night's show.
In a special performance, a hologram image of the pop star performed "A Slave to the Rhythm" from his recently released, already blockbuster posthumous album Xscape.
The Billboard Music Awards winner performed the first ever televised rendition of her new single "Tennis Court," which appears on her 2013 debut album, Pure Heroine.