They became only the fifth side to win a Grand Final -- adding the top domestic accolade to their Challenge Cup and League Leaders' Shield triumphs.
Orchestrated by the irresistible Mikey Lewis, Rovers built an early lead and withstood an inevitable fightback.
Joe Burgess soared over for his second try in the final minutes after intercepting a desperate pass from Harry Smith to cap a brilliant Rovers display.
Wigan failed to take their early chances, and from the moment Lewis jinked audaciously through for the opener midway through the opening period, Rovers were in charge.
Burgess added Rovers' second, both tries coming during a period of numerical advantage after Brad O'Neill was sin-binned for a tip-tackle.
Smith gave Wigan hope in the second half, but Jez Litten's effort on the hour all but sealed a richly deserved win for Rovers, with Burgess adding gloss to the scoreline in the dying moments.