The 'Price Tag' star is currently recording her second album, and tweeted from the studio where she is writing with Norwegian production team Stargate, 'Titanium' star Sia and Diane, famed for writing ballads for Celine Dion, Aerosmith, LeAnne Rimes and Toni Braxton.
Diane tweeted: ''Jessie J is f***ing singing her ass off right now!!!! (sic)''
Jessie later tweeted: ''Stargate + Sia + me + studio + writing + production + singing + living #livingthedream (sic).''
''It has to happen organically, depending on who's around.''
The 24-year-old singer also admitted she is worried about the pressure of creating a follow up to debut 'Who You Are', released in 2011.
She said: ''It took me seven years to get people interested in the first album so the pressure weighs heavy on my shoulders with the anticipation of the second.''