Jay Dee "B.J." Penn (born December 13, 1978 in Kailua, Hawaii) is an American professional mixe martial arts (MMA) fighter and Jiu-Jitsu practitioner, currently the Ultimate Fighting Championship lightweight champion. He holds notable wins over former UFC lightweight champion Sean Sherk, former UFC welterweight champion Matt Hughes, former PRIDE FC lightweight champion Takanori Gomi, former UFC lightweight champion Jens Pulver, and current DREAM competitor Caol Uno. His most recent title defense coming over the former champion, Sean Sherk, at UFC 84, which took place on May 24, 2008. He is the first American-born winner of the World Brazilian Jiu-Jitsu Championship (Mundial) in the black belt category (2000). Penn is also the former UFC welterweight champion and was a coach on the The Ultimate Fighter 5 reality show. After winning the lightweight title at UFC 80, he became only the second man (with Randy Couture) to win UFC titles in two different weight classes. He is currently ranked by MMAWeekly as the #1 Lightweight fighter in the world.