George Takei, most famous as Sulu on the original Star Trek series, just successfully helped raise over $150,000 for his Broadway musical, Allegiance, which deals with the wrongful internment of Japanese-Americans during World War II. 

He promised his fans he would perform his Happy Dance if successful and, to the dismay of his husband, delivers it beautifully. Naturally, his song of choice is Sexy And I Know It by LMFAO.