Britney Spears: is 'amazing'

Britney Spears has said that working with 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.'