The massively talented hopeful, 20, told viewers that she used to be in Neon Jungle, a quartet who disbanded in 2015.
She was met with an outpouring of love on social media – as viewers and fans reminisced over their brief tenure as one of the UK’s most exciting girlbands.
During their two years in the spotlight, they managed four Top 20 singles and one Top 10 album.
Their biggest hit, 2014’s Braveheart, peaked at No4 and was certified Silver in the UK.
They also had success with Trouble (No12), Welcome to the Jungle (No7) and Louder (No14).
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However when their fifth track Can’t Stop The Love missed the charts altogether, they had their record deal with RCA terminated.
Somewhat awkwardly, they received a nomination at the 2015 Teen Choice Awards for Next Big Thing after they disbanded.
Shereen was supported on the show by former bandmate Jessica Plummer, now an actress.
“Yes shezzy #teamcutty,” she tweeted.
The post was retweeted by Asami Zdrenka, who has continued to sing and persue modelling.
The Cutkelvins progressed to the next stage of X Factor, with Sharon Osbourne telling Shereen to take a more central role.
The programme continues on Saturday at 8pm on ITV.