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. Phinnaeus was shirtless in the clip, wearing only navy blue pants and a pair of Vans slip-on sneakers, as he rode around the court like a pro. "Who likes Butter?" Moder, 56, captioned the post, which drew a slew of fan reactions. "I'm a Skateboarding fan. My son taught me to love it and respect it as any other Sport!!," one person commented on the post.