11 of 16: Since starring as the child genius Doogie Howser on the TV show "Doogie Howser, M.D." until 1993, actor Neil Patrick Harris has made numerous and hilarious appearances on the big screen, including in "Harold and Kumar Go to White Castle" as a drug-crazed version of himself. He also starred on the comedy TV show "How I Met Your Mother" as the womanizing Barney Stinson. Harris announced that he was gay in 2006 on the cover of People magazine. (AP Photo)

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