As long as you're living right, then you don't have to worry about what people see.

It's important that I make a difference in some way. If it's performing and touching someone that way, that's great; if it's being a teacher and helping some kid understand something, that's even better.

I could have a degree in music and come on the show, and Simon could still say 'You stink'.

I think celebrities have an obligation to the public to not just sing or act.

Working with children with autism has provided me with an opportunity to see the world in a different way. I see them strive to overcome obstacles and persevere, and learn to persevere myself. They are my inspiration.

The biggest problem I had - and the biggest problem teenagers have - is not how they dress, how they look or how they act or talk. It's how they see themselves - their self-esteem. In the tenth grade, I realized I am who I am. I've got big ears and big feet. I can etiher sulk around or I can be happy with who I am. The minute I decided to be confident with who I was, all that other stuff stopped. It's all in the way you carry yourself.

Everyone deserves the best start in life, which is what UNICEF is working to provide the world's most vulnerable children. Education is essential to a child's development. I hope that as an Ambassador I can encourage people to join UNICEF's mission to make education a reality for children throughout the world.