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Jessie J has revealed she's worked on nine tracks for Justin Timberlake.
Speaking about the collaboration, she told The Sun: 'We wrote together recently...we wrote nine tracks.'
Jessie added that her other songwriting efforts had been unsuccessful.
'I recently wrote a track for Britney and I loved it but she didn't use it for her album'.
Jessie has previously written songs for Miley Cyrus and Chris Brown.