Season eleven of Dancing with the Stars premiered on September 20, 2010, on the ABC network. Several changes were introduced this season, including an "Acoustic Week," in which couples performed either the rumba or the Argentine tango while the audience was brought closer to the dance floor which was elevated and made circular. Contestants from previous seasons also came back as guest judges when the current contestants attempted re-created memorable routines in the 200th episode. These guest judges were Hélio Castroneves, Kelly Osbourne, Emmitt Smith, Drew Lachey, Gilles Marini, and Mel B. Kristi Yamaguchi and Apolo Ohno also served as team captains for team dances. There was also a week dubbed "Instant Choreography," in which the couples practiced their routines for a week, but only rece