Michael Douglas
Up until the 1950s, cheerleading was actually a primarily male sport. Choate Preparatory School was where Douglas learned to cheer, chant, tumble, and stunt, as with the rest of them. As scientist Hank Pym, when he was cast in the Marvel movies, he followed another former male cheerleader (Paul Rudd).
Megan Fox
In Transformers, Megan attended Morningside Academy in Port St. Lucie, Florida, before she broke her heart. The bombshell had been mocked at her school, turning to athletics for security. In movies like Teenage Drama Queen Confessions, where she played a cheerleader, she started acting!