Blonde and pink shorts: Angelina Jolie and Brad Pitt's 17-year-old son was photographed training in boxing.

Angelina Jolie and Brad Pitt's son attended a Muay Thai class in Los Angeles. 17-year-old Knox was photographed by paparazzi during the training session.

Knox Jolie-Pitt, who was recently seen with pink hair, has changed it to platinum blonde. He wore pink shorts and a black T-shirt to class.

Knox Jolie-Pitt is the only biological son of Angelina Jolie and Brad Pitt, who were together from 2005 to 2016. Knox has a twin sister, Vivienne; an older biological sister, 19-year-old Shiloh; brothers, Maddox and Pax; and sister, Zahara, whom Jolie adopted before having her own children.

Lately, Knox has increasingly attracted media attention with his public appearances. Fans of Jolie and Pitt note that as he ages, he's becoming a dead ringer for his father.

For the past two years, 61-year-old Brad Pitt has been dating Ines de Ramon, who is half his age. Following his divorce from Jolie, which was accompanied by lengthy court battles over custody and property division, the actor has lost contact with his two older children, and his daughters have dropped his last name. Angelina Jolie recently announced that she plans to move from the United States once her youngest children turn 18, but for now, she is forced to live near Pitt by court order.

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