I'm The One DJ Khaled feat. Justin Bieber Download 'I'm The One' on iTunes
Usher's been in town and he always has time for Capital's Rich and Kat.
He's been telling us about his birthday celebrations and partying in London. He also been chatting about where he finds his inspiration and possible future collaborations.
Within hours of his OMG UK tour going on sale, tickets for his O2 Arena shows sold out. He be playing dates across the UK in January and February 2011.
Here's your chance to listen back to the interview.