Julia Roberts’ eldest son, Phinnaeus, is flexing his moves at the skate park. Roberts’ husband, Danny Moder, shared a video of Phinnaeus, 20, shredding on a skateboard via Instagram on Monday, August 4.

Julia Roberts' son Phinnaeus, 20, shows off his skateboarding skills in a rare video shared to the actress' husband's Instagram page. Roberts and husband Danny Moder share son Henry, 18, and twins Hazel and Phinnaeus,