Sisters Jazzy, 24, and Ruby, 22, of Blonde Electra received the lowest amount of votes and were the first group to leave the competition during last night's results show.
Blonde Electra, who sung 'Kids In America' on Saturday night, said they were surprised to be voted off.
"We're a little bit shocked to be going in the first week," said the girls on The Xtra Factor. "We had so much fun on the show and we learnt so much being here. We made so many friends and they all deserve to be here."
Overload Generation, who were chosen as a wildcard, fought it out in the sing-off against Stephanie Nala.
Singing for their survival, Overload Generation sang 'A Thousand Years', while Stephanie belted out Brandy's hit 'Have You Ever'.
With the judges' decision split, the vote went to deadlock and Dermot O'Leary revealed the act with the second lowest votes was Overload Generation.
Also speaking to Sarah-Jane Crawford on The Xtra Factor last night, Joey, Andy, Jordi, Ryan and Ollie said: "It's gutting, we're not going to lie. At the end of the day we've had the best time of our lives. Literally, the whole experience has been mental, so we're just happy to have been part of it all."
Both Blonde Electra and Overload Generation were mentored by Louis Walsh, meaning he now has two groups left in his category - Only The Young and eight-piece boy band Stereo Kicks.
However, Louis didn't appear to be too bothered about his loss, as he left the X Factor studios in a rather jubilant mood last night.
The 62-year-old Irish star was pictured giving a thumbs-up sign to waiting photographers before making his way into a taxi.
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Watch Blonde Electra and Overload Generation speak below: