Knox Jolie-Pitt

Angelina Jolie and Brad Pitt’s son Knox Jolie-Pitt is switching things up -- stepping out with a bright new look ... orange hair and all! The 17-year-old was spotted leaving Muay Thai class in L.A. on Memorial Day ... and yeah, being inconspicuous was clearly not the assignment. Knox usually…

Brad Pitt and Angelina Jolie's son Knox's 17th birthday kicked butt -- literally -- because he spent his big day winning a martial arts competition. With Angelina and his twin sister Vivienne cheering him on from the crowd, Knox won the IKF Point Muay Thai Technical event on his birthday weekend.…