Growing up is one of life's inevitabilities. But this truth is most troublesome to one sector of the population: child stars. While some of these moppets become more famous with time (see: Drew Barrymore), others are never heard from again past puberty. Keep clicking to find out what some of our favorite, long-lost kiddie stars have been up to, starting with Macaulay Culkin, who became one of the most successful child stars of all time after he started acting at age 4. The New York native was the breakout star of 1989's "Uncle Buck" opposite John Candy before he found even more fame as Kevin McCallister in 1990's "Home Alone." Other notable turns include "My Girl" and "The Good Son." Oh, and he was also good friends with Michael Jackson.