The 'Who You Are' singer helped mentor the X Factor winners at Judges' Houses and will now contribute material to the band's upcoming record, the Sunday Mirror reports.
Speaking at the Brits Nominations Launch, Jessie J told the paper: "I'd love to write for them as they're great girls and have brilliant voices."
Speaking of her own material, she added that she's been influenced by Adele for her second album: "She's inspired me to admit that I'm having a bad day and that's okay," she said.
It was recently reported that Little Mix will have duets with Jessie J and X Factor mentor Tulisa Contostavlos on their debut album, which is due for release in the Spring.
Jessie J was recently nominated for three Brit Awards.
Watch Jessie J's video for 'Domino' below: