The way everyone in London is right up against each other makes it very real to you growing up, the fact that people have different lives to you. And that causes problems; of course it does.

My goal, my aim is to be a superstar, but not in a cheesy way. I want to go to America and do what they do. But better!

I've seen how much effort has to go into a tour, the performance and also how to look after yourself, not just physically, but mentally too.

Nigeria is like everywhere, really: there are some beautiful places that have been invested in and others that haven't been.

The surface of American life looks smooth, prosperous, peaceful. But underneath, fault-line shifts in family and work life have led us into what some have called 'advanced insecurity.'

Well, there are about 10 million children that aren't covered by health insurance. About 3 million qualify for Medicaid but don't get it, so we're going to reach out and bring more of those kids into the Medicaid program.

As a former board member for Teach For America, I understand that every child has the ability to learn and that, no matter their circumstances at home, we have a duty and a responsibility to educate them and to do it well.

I really love the TV thing because it's a little of the best of all worlds. You have a sense of a family and work with the same people over the seasons.