With his blond, all-American looks, Billy Kay could be cast equally well as the heartthrob or the troublemaker. The son of Broadway actress Linda Kay (who had appeared in the original cast of "The Sound of Music"), the talented youngster began his career when he was literally still in diapers, appearing in print and TV commercials at age six months. When he was a toddler, Kay made his feature film debut in the popular hit "Three Men and a Baby" (1987). As he aged, he began to appear in local theater productions, displaying his vocal prowess and dancing skills with turns as the Artful Dodger in "Oliver!" and as one of the leads in a stage musical adaptation of Mark Twain's "The Prince and the Pauper."