The fourth series of the ITV1 talent show, which began last Saturday, is proving a particular hit with younger viewers.
A total 10 million people tuned into the show at its peak last night - the best audience ever for the second episode.
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X Factor judges(from left to right) Louis Walsh, Sharon Osbourne, Dannii Minogue and Simon Cowell
The ratings were up by more than 1.5 million on last year's figures.
The hour-long show trounced BBC1 rival Dance X, which averaged just 3.6 million viewers, compared to X Factor's average of 8.5 million.
While the show was watched by people of all ages, it was most popular with 16-34-year-olds with 64 per cent of that age group tuning in.
Last week nearly 11 million people watched the opening episode which introduced new judge Dannii Minogue.
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Welsh wannabe Rachel Lester lets fly with an extraordinary four-letter tirade against the judges during Saturday's show
She has joined X Factor veterans Simon Cowell, Sharon Osbourne and Louis Walsh on the panel.
Walsh made a surprise return to the show after being axed and then reinstated.
Another new addition to the show is Dermot O'Leary who has taken over presenting duties from Kate Thornton.
A record 150,000 people applied for the fourth series of the show, which ends at Christmas.
Dermot O'Leary consoles a disappointed contetstant
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