The 25-year-old singer was found death in her home in West Hollywood on Friday morning and her GRL band mates have spoken out about their tragic loss.
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Tweeted from the band's account, they said: "Words cannot express the depth of our loss. Simone's incredible talent was only surpassed by the size of her heart."
Continuing their tribute, the girls said they will 'carry her memory with in in everything we do."
After auditioning for the X Factor USA in 2011, in front of Cheryl Fernandez-Versini and Simon Cowell, Simone joined GRL – put together by Pussycat Dolls creator Robin Antin.
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Cheryl, Simon and Mel B also spoke of their shock and heartbreak over Simone's death.
Simon tweeted: "I am so sad to hear about the news Simone Battle has passed away. She was such a fun nice person. It's such a loss. Rest in peace Simone."
Mel wrote: "Still in shock about the devastating news, I can not believe Simone Battle is no longer with us."
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Cheryl added: "Such tragically sad news to hear of the passing of Simone Battle. My thoughts and prayers are with her loved ones."
GRL's debut single Ugly Heart yesterday charted at 11 on the UK charts.