The "Bang Bang" singer performed Sunday night at the Troubadour in West Hollywood for a one-night event, "An Intimate Evening with Jessie J and the ROSE Challenge Winners."
The Rose Challenge was a social media contest the singer held for fans to write new lyrics to her album, "R.O.S.E."
During the night, Jessie debuted a brand new song that she had penned last week, and it's clearly inspired by her relationship with Tatum.
"Yeah I’m always dreaming bout tomorrow that I’m still overthinking yesterday where you go I know I’ll want to follow let’s make a promise on the day."
"Take it slow, baby steps So we don’t ruin what comes next Let’s be still, just stay calm // So we’re not rushing what we are // Pressure off, just have fun It’s not a race, no need to run If it’s forever Let’s just simply be in love."
"Let’s holds hands and squeeze a little tighter // If you stand still I will pull away you help my head feel a little lighter and I’ve bought you a better life, they say."
"Take it slow, baby steps So we don’t ruin what comes next // Let’s be still, take it slow // So we’re not rushing what we are // Pressure off, just have fun It’s not a race no need to run If it’s forever Let’s just simply be in love."
To make things even more special, Channing was in the audience as the lyrics were sung, and was seen clapping and loving his girlfriend's performance.
The two snuck out the back of the venue later in the night, clearly excited to go discuss her new hit song.
Jessie and Channing have been dating since last year, but only went public back in March after they were seen together in London.