in your wildest dreams, did you ever think katie holmes would appear on the reality show ‘so you think you can dance’? and not just appear… but perform? nevertheless, that’s exactly what the actress has done this thursday night.

the 30-year-old wife of tom cruise was tapped by ‘sytycd’ execs to perform on the show’s 100th episode. katie’s number? she shimmied around to ‘get happy’ by the legendary judy garland, paying homage to the late great star. see her performance after the jump!

i bet you’re asking yourself, since when did katie holmes sing… or dance, for that matter. since her appearance in broadway’s ‘all my sons,’ she’s become quite passionate about the art form.

katie & some others have recently founded the dizzy feet foundation, which helps provides scholarships to young dancers to help them realize their dream of becoming professional dancers. katie says, “i think it’s important for children to experience music and dance. every child should have the opportunity to discover what it is they like and have access to the very best in that pursuit.”