Girls Aloud star Sarah will take to the stage by herself for the first time in London to debut her new music to a crowd of lucky fans.
Sarah, 32, has been busy working on her own music for months and tonight will be the first time her followers will get to hear it.
Yesterday, Sarah's boyfriend Mark Foster shared a new picture of the singer during a rehearsal for the gig. She can be seen in a studio with a band and backing singers.
Posting it on Twitter, Mark said: "@SarahNHarding sounding great in rehearsals."
Last month, Sarah spoke about her new music during an interview on ITV1's Lorraine, saying that working on it was "cathartic" following her 2011 rehab stint.
Sarah was treated for depression and alcohol issues in a South African clinic but said: "What doesn't kill you makes you stronger, I always say.
"All I've been doing recently is concentrating on getting my new music together. I've been working on it for about four years on and off. It's been really cathartic."
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