Pics: 'DWTS' Trios Get Silly in Rehearsal

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In addition to each couple's solo dances tonight, the latest challenge posed to the cast of ABC's Dancing With the Stars: All-Stars is a trio routine. An extra pro will join each pair. Check out these goofy photos of the threesomes in rehearsal, starting with this one of Gilles Marini, Peta Mergatroyd, and Chelsie Hightower planking.