Fleur, who is currently on 'The X Factor Live Tour', enjoyed a day off from performing to attend the party on Monday night (2 March), which was hosted by The Sun newspaper.
Fleur nailed sophisticated chic in a fitted white dress and matching coloured heels. And that wasn't the only coordinating by Fleur, as she also matched her coral lips to her clutch bag!
She finished off her look with a pale grey coat. In the words of Louis Walsh, she looked like a ready-made popstar!
In fact, Fleur's outfit was so popular that Only The Young's Betsy-Blue English turned up in similar ensemble!
Cosying up for a snap, Betsy tweeted: "So me and my boo @FleurEast turn up in the same outfit to the party of coooourse!"
In January, Fleur's dreams came true after she signed a record deal with Simon Cowell's label Syco.
Fleur, who came in second place on the ITV talent show behind winnner Ben Haenow, will release her debut album later this year.
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!
Relive Fleur's epic 'Uptown Funk' performance on The X Factor below: