According to People, there're 5 things to know about Mario Testino

1. His client list is a veritable Who's Who of Hollywood
Jennifer Aniston, Cameron Diaz, Madonna and Demi Moore

2. He knows Prince Harry, too

3. Madonna helped launch his career
His Versace campaign featuring the material girl was called "Versace presents Madonna by Testino." "It made quite an impact," he has said. "I was a no one. Who is this Testino? It did change the way people saw me. I became a brand."

4. The Princess Di photo helped him save children's lives

5. He almost became a man of the cloth

Source: People Magazine