Last night's 11th episode, which saw a singing plumber and a 12-year-old classical singer voted through by the public to Saturday's final, was watched by an impressive 41.7% share of the audience between 8.30pm and 10pm.
The bumper ratings come after ITV announced yesterday that former Daily Mirror editor Piers Morgan, a judge on 'Britain's Got Talent', has signed an exclusive two-year deal with the broadcaster which will see him continue to sit on the judging panel and also front a new chatshow.
The penultimate episode of BBC One's comedy drama 'The Invisibles' had a lowly 2.5m viewers and a 10.5% share between 9pm and 10pm.
Channel 4's cookery-based reality show 'Come Dine with Me' held steady from last week with 2.2m viewers.
Last night's show, which featured the UK's first live ad from carmaker Honda at 8.10pm, drew a 10.1% share of the audience at 8pm-9pm. Including Channel 4+1's time-shifted audience, the ratings increased to 2.3m viewers and a 10.6% share.
'Come Dine with Me' was followed by a documentary about commuting hell, called 'Gridlock and Road Rage', which brought 1.3m viewers and a 5.5% share between 9pm-10pm. Including Channel 4+1's ratings it earned 1.5m viewers and a 6.3% share.
Five's US medical drama 'House' earnt 1.4m viewers and a 6.1% share between 9pm and 10pm.
'House' was immediately followed by another hospital drama from the US, 'Grey's Anatomy', with 700,000 viewers and a 3.8% share.