As Dancing With the Stars fans wait to see which celebrities are gracing the ballroom on season 34, cohosts Julianne Hough and Alfonso Ribeiro got in on the fun with their own performance. In Us Weekly's exclusive first look at the extended promo for season 34, Hough, 37, and Ribeiro, 53, busted a move to "Pump Up the Jam" by Technotronic before ABC's ballroom dance competition returns on September 16. The network already announced that TikToker Alix Earle and Steve Irwin's son, Robert Irwin, are competing for the mirrorball trophy next season.