Iggy Azalea turned up to perform her new single 'Problem' featuring Ariana Grande.

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Billboard Music Awards 2014 In Pictures

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Iggy Azalea turned up to perform her new single 'Problem' featuring Ariana Grande.

Iggy Azalea turned up to perform her new single 'Problem' featuring Ariana Grande.

8. Iggy Azalea turned up to perform her new single 'Problem' featuring Ariana Grande.