Fleur, who signed a record deal with Simon Cowell's label Syco earlier this month, shared a photo with fans on Twitter as posed in the building.
Dressed in a check shirt dress and black leather jacket, Fleur beamed from ear-to-ear as she stood in front of the backdrop of Sony's logo.
Fleur came runner-up in last year's X Factor, and her career is set to soar as she'll be releasing her debut album later this year.
Speaking about her recording contract on ITV's Loose Women two weeks ago, Fleur said: "It hasn't sunk in. This time last year I was sitting in my dressing gown and I was just watching reruns of programmes and just thinking, 'What am I going to do?'
"Singing is all I know and music is all I've ever been passionate about."
Fleur's signing with Syco has made her the first contestant from series 11 - apart from winner Ben Haenow - to be signed.
It's set to be a busy few months for rising star Fleur, as she'll also be joining some former contestants on X Factor's live tour, which kicks off on 13 February in Belfast.
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