Chmerkovskiy, 33, will serve as a guest judge for the semifinal performances. Chmerkovskiy, whose brother Val was eliminated earlier this week, left the show two seasons ago after appearing in 13 seasons. He most recently starred in Forever Tango on Broadway.
Chmerkovskiy isn't the first former pro to return to Dancing with the Stars this season as a guest judge. Julianne Hough ruffled a few feathers when she served up some surprisingly harsh criticism of former colleague Mark Ballas earlier this season.
Dancing with the Stars airs Mondays at 8/7c on ABC. Are you excited for Maks' return?