BJ Penn also known as "The Prodigy" and "Baby Jay", is an American professional mixed martial arts fighter and Brazilian Jiu-Jitsu practitioner who is currently the Ultimate Fighting Championship (UFC) Lightweight Champion. In 2000, he became the first American-born winner of the World Jiu-Jitsu Championship in the black-belt category. Penn is also a former UFC Welterweight Champion and was a coach on the The Ultimate Fighter 5 reality show. He became the second fighter to win UFC titles in two different weight classes after he won the lightweight title at UFC 80. He is currently ranked by Sherdog as the #1 Lightweight fighter in the world and by MMAWeekly as the #2 lightweight fighter in the world.