Problem Ariana Grande feat. Iggy Azalea
Britney Spears has said that working with will.i.am was 'amazing'.
The singer told Ryan Seacrest: 'Oh my god, he's amazing! He's so much fun and he's funny and he's a charm.
'I love him, he's great. I love the Black Eyed Peas so when they told me I'd be working with him I was just like 'oh my God, I can't wait!'
She also talked about her workout routine.
'I have a trainer,' she said 'I'm on the treadmill for 30 minutes and we do a lot of cardio and running- he kicks my butt. You pay to hate your trainer, it's so odd.'