The 28-year-old Olympic ice dancer and 35-year-old professional dancer filmed the ABC reality competition's 10th anniversary special Monday to air Tuesday. Davis and Chmerkovskiy won season 18 in May 2014.
The former partners delighted fans with their performance to "Heroes (We Could Be)" by Alesso. The pair sparked dating rumors in competition, and Chmerkovskiy's brother Val previously declared, "He loves her probably more than I've seen him love another woman."
Kelly Monaco, Alfonso Ribeiro and Melissa Rycroft are among the other series winners who returned for the television special. Season 20 is currently underway and airs Mondays at 8 p.m. ET. Willow Shields and Mark Ballas were eliminated this week, while Derek Hough remains unable to dance due to injury.