The Geordie star, 30, is set to release new material in the coming months and has been teaming up with Nicola in the studio.
Cheryl formed a close bond with Nicola after finding fame on Popstars: The Rivals back in 2002 and it seems they not only play hard together, they work hard together too.
Last night, 28-year-old Nicola told her Twitter followers: "I have loved writing for Cheryl! So much fun!
"Sometimes a heavy heart has come, being a best friend & writing from that perspective for her."
She added: "Can't wait for you to hear her new music..."
Newly-appointed X Factor judge Cheryl also took to Twitter to praise Nicola's songwriting skills and even described her as a "volcano".
"@NicolaRoberts is like a little volcano just bubbling away waiting to erupt with hits! #watchthisspace #mygirl #soproud," she said.
Cheryl isn't the first singer that Nicola has written for. The Liverpudlian has already penned three songs for Little Mix!
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