Macaulay Culkin was just 9 years old when he starred in "Home Alone," the highest-grossing live action comedy of all-time. The actor, who turned 30 on August 26, later made headlines for befriending Michael Jackson and getting married at age 17. Kevork Djansezian/GettyImages.com - March 7, 2010
Child Stars Turning 30 in 2010
See which former child stars are celebrating their 30th birthday in 2010.