'Do It Like A Dude' hitmaker Jessie dedicated her 'Man Crush Monday' post to Luke this week (3 November), before sharing a photo of the pair on the social networking site.
She said: "My first ever official #mcm. My man. My crush. My Monday morning. So it's only right. @wolfjames."
Jessie and Luke first sparked romance rumours earlier this year, and it seems like things are now official.
Luke also shared some cosy Polaroid snaps of the couple on his Instagram account, simply saying, "a new feel".
And in another photo showing himself, Jessie and a friend, Luke said: "My bro @mrjewelzxavier and my babe @isthatjessiej and I mobbing my city streets."
Luke, who has written songs for the likes of Chris Brown, Britney Spears and Justin Bieber, has previously been a support act for Beyoncé on her 'Mrs. Carter Show World Tour'.
Luke was also a supporting act for Jessie last month at one of her concerts in New York.
In April this year, Jessie hit back at trolls in a lengthy Twitter rant following an interview about her sexuality.
Former Voice UK coach Jessie previously admitted that she had dated boys and girls in the past, but in a new interview, she revealed that she no longer identifies herself as bisexual.
Jessie, who likes to keep her relationships private, added: "Behind closed doors I am evolving into the woman I want to be forever, wanting a husband and kids one day and dreaming up my future just like everyone else.
"I am only singing about loving a man and being broken hearted by a man because I only date men."
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Watch Jessie's music video for 'Bang Bang' below: