Bieber has reportedly dated both Kourtney and Hailey.
And on Monday morning the Cold Water hit maker was spotted leaving the beauty's LA home in his white Mercedes-Benz G-class.
'She and Abel have been going back and forth for a few months about their relationship,' an insider told People.
It's the third sighting of the exes hanging out in recent weeks, as Justin was also seen visiting Selena at her home last Sunday, staying until around midnight.
This confirms it: When this photo of the two hugging in January outside Giorgio Baldi in Santa Monica, California surfaced, it was revealed they were an item, and it was added they had been dating for months Though it is now known she is no longer dating The Weeknd - whose real name is Abel Tesfaye - as recently as Sunday evening it was claimed that the singer 'doesn't care' that the former flames are hanging out.
In the image of Justin and Selena, the two stars are seen sitting opposite each other, Justin's head covered in a white hooded sweatshirt.
Selena is seen in a striped sundress as she sits with her elbows on the table talking to her former flame.
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The timing is interesting as in the past week the Fetish singer, 25, has been spotted with her ex-boyfriend Justin Bieber three times.
On Sunday they were seen getting a vegan breakfast together in LA.
One family member is quoted as telling the site: 'Justin is a vile human and will never be accepted by us.