The singer, who was mentored by Rita Ora in the girls' group, was invited to perform at London's famous G-A-Y on Saturday (12 December) and had an "amazing night"... And it looks like the crowd loved it too!
Dental receptionist Lauren performed Mariah Carey's 'Vision Of Love' and Ariana Grande's 'One Last Time' to a roaring crowd of fans.
Wearing a fabulously sparkly black all-in-one, Lauren showed Simon Cowell what he's missing out on!
After the performance, Lauren tweeted: "THANKS FOR HAVING ME G-A-Y @JeremyJoseph last night was amazing!!! The crowd had the BEST ENERGY!!"
Sharing a short film of the rowdy night, she added: "G-A-Y went off OFF."
Lauren left The X Factor in an impressive fourth place, during the semi-finals.
Finding herself in the bottom two with Ché Chesterman, she left the competition after receiving the least public votes.
However, she will take part in The X Factor Live Tour 2016, which kicks off in February.
G-A-Y before the party startedpic.twitter.com/XPI0E7zLEY— Lauren Murray (@laurenmurray) December 13, 2015
Lauren will also take part in Sunday's final (13 December), which begins at 8pm.
On her way to Wembley's SSE Arena, she tweeted her 89,800 followers: "On my way to X Factor for the last time ever! Who you lot rooting to win tonight?"
The climax of the show will see finalists Louisa Johnson and Reggie 'n' Bollie perform their version of the winner's single, a cover of Bob Dylan's 'Forever Young'.
One Direction will perform for a final time before going on hiatus, as will Adele and Coldplay. What a line-up!
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