Julia Roberts’ 20-year-old son, Phinnaeus Moder, is putting his skateboarding skills to the test, and his dad caught it all on video. Danny Moder, Roberts’ husband and a renowned cinematographer, shared a rare clip of their son on Instagram Monday,

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,

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.