Nicki Minaj kicked off the iHeartRadio Music Festival with a bang! On Friday (Sept. 19), the Young Money superstar was on an all-star bill that also included her 'Bang Bang' co-star Ariana Grande who also performed at the event.

Dressed in an all-black diamond-studded bra and leotards with royal prints and black sneaker wedges, the Queen Barbz ran through her hits including 'Beez in the Trap,' 'Super Bass,' and of course, her booty anthem 'Anaconda.'

However, Minaj suffered some audio problems midway in when she performed her verse from Beyonce's 'Flawless' remix. "iHeartRadio, do we have a problem?" she yells, before quickly clarifying, "no, I don't mean you, I mean [the sound guys] in the back."

According to Billboard, Minaj triumphant over the audio glitch by spitting her 'Flawless' verse a cappella style, which totally slayed the audience.

Then Minaj kicked it up a notch by bringing out a surprise guest -- Ariana Grande. The hip-pop tandem performed their chart-topping single 'Bang Bang' sans Jessie J, who was touring in Europe. Minaj and Grande's turned it up for fans by bumping butts together ala Jennifer Lopez and Iggy Azalea in the 'Booty (Remix)' video.

Prior to Minaj's performance, Grande hit the stage for a quick set. Dressed in a sparkling black outfit with cat ears, the pop chanteuse sang several tracks from her latest effort, 'My Everything,' including 'Problem.'

Watch Nicki Minaj and Ariana Grande's performances below.

Watch Nicki Minaj and Ariana Grande Perform 'Anaconda' at iHeartRadio Festival

Watch Ariana Grande Perform 'Problem' at iHeartRadio Festival

Watch the Ultimate Nicki Minaj Twerking Supercut