LOS ANGELES, Calif. -- Katie Holmes donned a pair of dark stockings and a black costume as she sang and danced 'a sort of homage to Judy Garland' as part of 'So You Think You Can Dance's' 100th episode celebration on Thursday night.The actress lent her vocal pipes to 'Get Happy' as she danced in short-shorts, a black satin jacket and a fedora in a pre-taped performance for the FOX reality show.