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Santa Monica High School

Santa Monica High School bolsters a huge list of famous ex-students, including Sean Penn, Rob Lowe, Charlie Sheen, and Robert Downey Jr. Rob wrote about his friendship with three actors during school, as well as his closeness to Charlie's brother, Emilio Estevez.

Source: Getty
Read More Rob LoweRobert Downey Jr.Sean PennCharlie Sheen