sentences:  The couple earned the first perfect 40 of the series for their salsa in the semi-finals, followed by an additional three in the finals giving them a perfect total of 120 points, a previously unmatched feat.On 20 December 2014 Flack and Kovalev became series champions.On 16 April 2015 it was announced that Flack, along with Murs would replace Dermot O'Leary as the hosts for the 12th series of "The X Factor" from August 2015.