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The eight-piece boyband were all in tears after the judges failed to come to a unanimous decision after they sang Jason Mraz’s ‘I Won’t Give Up’ in the sing-off with Lauren, who performed ‘I Know Where I've Been’ from ‘Hairspray’.
The boys’ mentor Louis Walsh opted to send home Lauren, and Mel B agreed.
After Lauren’s mentor Cheryl Fernandez-Versini and Simon Cowell voted to save the 17-year-old, it was up to the public to decide who should leave the show after the decision was taken to deadlock.
Lauren Platt and Stereo Kicks wait to learn their fate
After being told they were going home, a clearly upset Casey Johnson of Stereo Kicks was left struggling for words.
He said: "We're going to stay together. We did not want to go out."
His bandmate While Tom Mann added: "Every act now is amazing, it was always going to be tough. But this is just the start.
"Thank you everyone who voted, you've been amazing."
Louis Walsh later said: "It was awful. I really think everybody made a mistake. It's awful that they're gone. I think they had so much more potential."
However, Simon defended the decision, telling 'The Xtra Factor': "The sing-off is there for us to make the decision about who was best on the night.
"I didn't chicken out."
Simon added that he would have sent Lauren home but based on their performances, he decided to change his mind.
Joining Lauren in next week’s semi-final are Andrea Faustini, Fleur East and Ben Haenow.