The TV musical Glee, which debuted in 2009, follows the adventures of a diverse high school singing group who covers everyone from Michael Jackson to Madonna. The show has become famous for its jubilant song and dance numbers as well as for its guest stars. Gwyneth Paltrow made headlines with her turn as a mini-skirt clad substitute teacher who wowed with Cee-Lo's "Forget You," while Ricky Martin did a chair dance to LMFAO's "Sexy and I Know It." Legendary comedienne Carol Burnett also appeared as the Nazi-hunting mother of Sue Sylvester (actress Jane Lynch), leading the two in a duet of "Ohio." Who's been your favorite guest star on Glee?