More than 18m people tuned in to watch dance group Diversity's shock victory over singer Susan Boyle on Britain's Got Talent, early figures show.
Viewing figures peaked at 18.5m on Saturday night when the 11-strong group from Essex were announced the winners.
ITV say it is the most watched TV show since the Euro 2004 England v Portugal match, which attracted 20.66m viewers.
Diversity defied predictions to win the £100,000 prize and the chance to perform at the Royal Variety Show.
During the final show, an average of 15m people and a 70% audience share watched the three sets of brothers and four friends perform their routine which judge Simon Cowell described as "sheer and utter perfection".
Boyle, who sang I Dreamed A Dream from Les Miserables - the same song that catapulted her to global fame - was gracious in defeat saying that "the best people won" adding: "I wish you all the best."
Saxophonist Julian Smith, 39, from Birmingham finished in third place in the competition.