In the third of the five semi-finals, father and son Greek dancing duo Stavros Flatley was voted through to Saturday's final.
The 8.30pm-10pm programme drew an average of 12.7m viewers and a 49.7% share of viewing.
ITV1's terrestrial rivals combined were only able to manage half its audience at 9pm-10pm, together mustering a 25.5% share.
This included an 11.7% share for BBC One's one-off David Attenborough-fronted special on a fossil that scientists believe could be a missing link between smaller mammals and higher apes. Just 3m tuned in for 'Uncovering Our Earliest Ancestor: The Link'.
'CSI' on Five brought in 1.9m viewers for a 7.8% share. The crime show is close to the end of its long run with just four of 24 episodes to go.
BBC Two attracted 1m viewers with historian Simon Schama's portrait of Jacobean poet John Donne, earning a 3.6% share.
Channel 4's Time Team searched for a perfectly preserved World War I bunker and ended up with an audience of 800,000 and a 3.1% share. Its showing an hour later on Channel 4+1 brought in 100,000 viewers.
Tonight ITV1 is airing the Champions League football final between Manchester United and Barcelona in Rome. Last year's final between United and Chelsea gave the channel its best ever audience for the event, with a peak of 14.6m viewers.
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