Booboo was born in Beverly Hills, California to Nils Allen Stewart Sr., and Renee Stewart. His father is of Russian, Scottish and Blackfoot Native American descent and his mother is of Japanese, Chinese and Korean descent. In 2004, he appeared in Eminem's 'Just Lose It' video and, in 2007, toured with Miley Cyrus during her Best of Both Worlds Tour.He is very talented at martial arts. In both 2002 and 2003, he won the Junior Martial Arts World Championships. In 2004, he was inducted into the Martial Arts Junior Hall of Fame. He has gone on to do stunt work in films, including Beowulf (2007).From 2004 to 2010, he did a number of acting roles in both TV and film. His breakthrough role came when he was cast as Seth Clearwater in the third installment of The Twilight Saga, _Eclipse (I) (2010).