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

This image appears in the gallery:
Billboard Music Awards 2014 In Pictures

1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 

10. 18 images

See the full gallery: Billboard Music Awards 2014 In Pictures