Calista Flockhart
Remember that star of Ally McBeal? Calista Flockhart was always performing, even as early as cheering for Shawnee High School in her hometown of New Jersey. Then, she graduated and attended the Mason Gross School of the Arts at Rutgers University, where her career really started to gain traction.
Michael Douglas
Up until the 1950s, cheerleading was actually a predominantly male sport. Choate Preparatory School was where Douglas learned to cheer, chant, tumble, and stunt, as with the rest of them. He joined another former male cheerleader (Paul Rudd) as scientist Hank Pym when he was cast in the Marvel movies.