All four judges were unanimous in their praise for the singers, giving them a standing ovation.
Nick Grimshaw's praise for the four-piece group was particularly gushing, calling their performance “perfect”.
In a reference to Beyonce's former alter-ego, he said: "You grew into women before our eyes tonight. I didn’t see 4th Impact tonight, I saw four Sasha Fierces."
Cheryl Fernandez-Versini was equally glowing. “That is what stars do – we suffer things like this. That says a lot about what you girls can be”, she said.
X Factor - Very photoshoot
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Simon Cowell praised the group too, saying: "That was, under the circumstances, one of the most incredible things we’ve seen on this show. Outstandingly good."
