More than half of voters (52.4%) in our exclusive poll named the girl group's rendition of 'Don't Let Go (Love)' by En Vogue the best performance of the night.
Tulisa Contostavlos's band were previously named the top act of Halloween Week and have finished as runners-up in Digital Spy's last two polls.
Last week's victor Amelia Lily came second with 15.7%, just beating Marcus Collins and his Ghostbusters-inspired performance of Jackie Wilson's '(Your Love Keeps Lifting Me) Higher and Higher', which appealed to 14.4% of viewers.
Craig Colton, however, failed to impress with his James Bond cover 'Licence To Kill', which received just 2.6% of the votes.
In our poll, Misha B just won the battle to keep out of the bottom two, with 7.6% of the vote to Janet Devlin's 7.3%.
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