The Voice coach has apparently been secretly meeting up with Tinie Tempah since they performed together last year.
A source told The Sun: "They had a few big nights out and realised they were attracted to each other."
"Jessie started going over to see Tinie at his place when they had a day off and one thing led to another.They both like each other a lot."
Jessie J is also said to have been getting Tempah's advice for her role as a coach on The Voice UK.
"Jessie has admitted to a few friends she has a secret boyfriend at the moment, but she has been keeping it close to her chest. Tinie is playing things cool," the source added.
Jessie J has previously admitted that she'd like to work with Tempah on her second album.
