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The music mogul lost his mum Julie Brett just before filming of auditions for the ITV talent show began last month, and as one hopeful tried out for the judges with a song dedicated to his late best friend, it all became too much for Simon.
Josh Daniel told of how he’d lost his friend two years ago, and would be singing Labrinth’s ‘Jealous’.
He explained how the lyrics meant something different to him, saying how he was jealous of his friend who was in a better place.
Tears welled in Simon’s eyes throughout the performance, as he tried to fight breaking down by drinking water.
As Josh finished his rendition, Simon winked at Cheryl Fernandez-Versini to tell her he was unable to speak, at which point the Geordie judge also broke down.
“That was the most captivated I’ve been in all the auditions so far. You really touched me, I believed every word you sang,” she said through a stream of tears.
As the day of auditions ended, Simon then made a swift exit from the panel, quickly followed by Cheryl who told members of production to “leave him” when they made an attempt to chase after him.
Tearing off his microphone, Simon climbed aboard a golf buggy as a teary Cheryl asked fellow judge Nick Grimshaw, “I don’t know what to do. Do I go or do I stay?” before the episode ended.
Simon previously revealed that filming the show actually helped him cope with his mother’s passing, telling The Sun: “I know it sounds like a cliché, but having such a strong bond with my mum meant I knew exactly what she'd have said. It would have been, 'This is your show, you love the show, go back and do your job'.
"I'm not going to lie, there were times it was incredibly difficult, but then there were other times I was able to switch my mind off and concentrate on what was happening and the contestants."
‘The X Factor’ continues next Saturday (5 September) at 8pm on ITV.