Ariana Grande Joins Iggy Azalea On Stage for 'Problem' After 'Fancy' Performance at Billboard Music Awards 2014 (Video)

Ariana Grande and Iggy Azalea strike poses during their great performance of “Problem” at the 2014 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday (May 18) in Las Vegas, Nev.

Before the 20-year-old entertainer hit the stage, Iggy performed her hit “Fancy” alongside Charli XCX in front of the roaring crowd. Both performances were so good – you must watch below!

“thank you @billboard #bbmas for having me and my loves for cheering me on �’��’� I love u �’��’�🌜” Ariana tweeted after she hit the stage.

FYI: Ariana is wearing Harry Kristoff boots.