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MC Style - Ludacris dressed the part as the host of the 2014 Billboard Music Awards in Las Vegas. The rapper got nostalgic thinking about his first Billboard chart topper, "Stand Up." (Photo: Ethan Miller/Getty Images)

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World Cup Ready - Jennifer Lopez, Pitbull and Brazilian pop star Claudia Leitte kicked the show off with a debut performance of their World Cup anthem "We Are One." (Photo: Ethan Miller/Getty Images)

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Mr. Worldwide - Pitbull has been nominated for 11 BBMAs, and won in 2012 for his collaboration with Ne-Yo "Give Me Everything." (Photo: Ethan Miller/Getty Images)

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Golden Girl - Jennifer Lopez became the first woman to receive the Billboard Icon Award. (Photo: Ethan Miller/Getty Images)

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Miss Fancy - Iggy Azalea performs her hit "Fancy" with the help of a cheerleading squad. (Photo: Ethan Miller/Getty Images)

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Pitch Perfect - Ariana Grande invades Iggy Azalea's set to belt out "Problem." (Photo: Ethan Miller/Getty Images)

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Royals Treatment - After winning two Billboard Music Awards, Lorde performed for the first time her new single "Tennis Court." (Photo: Ethan Miller/Getty Images)

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Wiz Kid - Wiz Khalifa presented the Top R&B Song to Robin Thicke for his 2013 summer jam "Blurred Lines."  (Photo: Ethan Miller/Getty Images)

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Special Shout Out - Thicke made sure to give a special thank you to "my wife, for her love and support and for putting up with me all these years." (Photo: Ethan Miller/Getty Images)

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Legend in the Making - Introduced by wife Chrissy Tiegen, John Legend performed a medley of his hits including "You & I" and "All of Me."   (Photo: Ethan Miller/Getty Images)

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Spark Plug - Looking amazing in a black dress, Jordin Sparks introduced her man Jason Derulo. (Photo: Ethan Miller/Getty Images)

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Dirty Dancing - Jason Derulo had the audience on their feet with his performance of "Talk Dirty." (Photo: Ethan Miller/Getty Images)

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What It Do, Snoop - Before introducing Miley Cyrus, Snoop Dogg popped in on Jason Derulo's performance. (Photo: Ethan Miller/Getty Images)

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He's Different - 2 Chainz also joined Derulo on stage for a verse or two. (Photo: Ethan Miller/Getty Images)

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Introducing Mrs. Witherspoon - Newlywed Kelly Rowland presents the Milestone Award to Carrie Underwood. (Photo: Ethan Miller/Getty Images)

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Hey, Hey Paula - Robin Thicke gave an impassioned performance of his new track "Get Her Back," dedicated to winning back his estranged wife Paula Patton. (Photo: Ethan Miller/Getty Images)

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Hopeless Romantic - Jennifer Lopez bookended the show with a performance of her new single "First Love" at the awards.    (Photo: Ethan Miller/Getty Images)

Photo By Photo: Ethan Miller/Getty Images

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Resurrecting the King - Even posthumously, Michael Jacskon can deliver the goods. A holographic version of the late pop icon performed "Slave to the Rhythm," a single off of a new album of MJ's unreleased tracks.  (Photo: Kevin Winter/Billboard Awards 2014/Getty Images for DCP)