Knox Jolie-Pitt was spotted preparing for a fight in his boxing studio [PHOTOS]

Knox Jolie Pitt has started boxing. The 16-year-old son of Brad Pitt And Angelina Jolie was spotted preparing for a fight in Los Angeles. It seems Knox is following in his father's footsteps, amid the 25th anniversary of his fan-favorite film Fight Club.

Knox looked all grown up as he prepared for his workout, wearing black shorts, a cream t-shirt and white Adidas sandals. He was photographed wearing boxing gloves and had bandaged hands.

The former celebrity couple has six children, including 23-year-old Maddox, 20-year-old Pax, 19-year-old Zahara and 18-year-old Shiloh. Knox and his twin sister Vivienne turned 16 on July 12. Vivianne made headlines for her role in the musical “The Outsiders.”

And although Angelina and Vivienne have been spotted together on the red carpet and photographed on recent outings this year, it seems Knox prefers to keep his personal life private and stay away from the spotlight.

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As for the rumors about the children's estranged relationship with their father, Shiloh recently requested to drop Pitt from her last name and wants to officially change her name to Shiloh Nouvel Jolie.

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Shiloh is not the only one of the six children who has expressed a desire to drop her father's surname; Vivienne, Zahara and Maddox have also dropped “Pitt” from their names.

“As Shiloh's attorney, I am obligated to post a legal notice because California law requires that of anyone who wishes to change their name,” Peter Levine, Shiloh's attorney, told Us Weekly. The hearing took place in Los Angeles on August 19.