Could Jude Law’s boy be a rock star in the making? The Alfie actor tells In Touch that 13-year-old Rafferty went heavy metal with his Halloween costume this year. “My eldest son was Slash from Guns N’ Roses,” Jude said at the Only Make Believe 10th Anniversary Gala in New York on November 2. However, the star’s other children with ex-wife Sadie Frost — 9-year-old Iris and 7-year-old Rudy — took the more typical turn. “My daughter was a witch, and my little boy was a skeleton,” he added. Since he has been moonlighting as Hamlet on Broadway, the proud pop took his brood out for a little trick or treat earlier in the day- in his own more silly than spooky attire. “I was Bert from Sesame Street. With the head slightly melted. It was a mashed-up Bert, but the children liked it!” Jude laughed. The green-eyed hunk also has an infant daughter, Sophia, with former fling Samantha Burke.