Saturday's show was watched by only 870,000 viewers at 9PM yesterday, ahead of only last month's clash with the England's Euro 2012 quarter final match.
So far this series of the reality show is slightly up on last year's run, but mainly thanks to the addition of Channel 5's new plus one service.
ITV1's Superstar meanwhile dipped to below 3 million viewers, as the finalists were revealed.
Just 2.89 million tuned in to Saturday's third installment, which saw Lord Andrew Lloyd-Webber, Mel C and Jasono Donovan pick their final 10.
While the shows have never been huge hits like The X Factor, previous series on BBC One have still attracted healthy audiences of around 4-5 million viewers.
Both shows continue tonight, with Superstar live on ITV1.