Chrissy Teigen and John Legend have disco fever. The couple kicked off their weekend in retro fashion literally, donning spot-on costumes for a '70s-inspired date night. The singer had fun striking a classic '70s pose for Instagram, but joked in his caption that he resembled something more familiar to today's era. Chrissy also demonstrated some serious moves of her own, but quipped that she may need a little time to recover.