He's sold tens of millions of albums worldwide and has won five Grammy Awards.
So it came as a real shock for children at a youth club in London when R'n'B superstar Usher popped in for a visit!
He surprised the group who were on his New Look Foundation Project. It's all about encouraging young people to realise their potential and follow their dreams.
If that wasn't enough, the singer had another surprise in store too... Leah was there to find out more...