Dancing with the Stars: Behind the Scenes!J.R Martinez wigs out! Rob Kardashian & Derek Hough re-enact Lady and the Tramp! See how the contestants goof off when they're not on the parquet!

WIG OUT

Unbe-weave-able! Lacey Schwimmer shared this photo of pro dancer Peta Murgatroyd's wig – on champ J.R. Martinez's head. "So pretty!" Schwimmer joked. His moves are just as elegant: Martinez and partner Karina Smirnoff ended their winning run with a perfect-score dance!



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