Also, remember he was a Disney kid before he joined NSYNC, starring on the New Mickey Mouse Club. It's not a guarantee of success, but they do train them in the basics of acting pretty well, and if the kid has talent, it can give them a good boost as they get older.
Kurt Russell started out similar, cutting his teeth on Disney roles before moving on to more serious fare.
Don't believe everything on the Interwebz! A duck's quack DOES echo!