The 'Price Tag' singer was so in awe of Morrison's passion for music when working on his single 'Up' that she now wants them to reunite for her sophomore LP.
"'Up' was the first song I'd ever recorded that I hadn't written and it was such a big deal to do that," she told the Daily Star.
"When James sent me the demo, I just couldn't get the song out of my head. So when I went to the studio I wanted it to be perfect for him because I knew how personal 'Up's lyrics were to him."
The 23-year-old, who confirmed that she is bisexual earlier this year, also named gay soul star B Slade as a dream collaborator, saying she had been moved by his struggle to overcome prejudice in the music industry.
"[B Slade is] this amazing artist who used to be called Tonex, but he retired when there was a lot of bad publicity when he revealed he was gay," she said. "B's voice is just insane."
Jessie J previously said that she hopes to record a "feminist" duet with Tulisa Contostavlos and work with the "incredibly talented" Ed Sheeran.
She revealed this week that her second album will feature "a lot more pain" than her debut record Who You Are.
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Watch Jessie J and James Morrison in the video for 'Up' below: