The pair reportedly tried to make things work, but have chosen to step away for the time being, TMZ reports.
The pair were last seen together in public, looking totally in love, at the premiere of Scott's new Netflix documentary, Travis Scott: Look Mom I Can Fly in August. The couple packed on the PDA on the red carpet, and attended the event with their baby girl.
The pair first sparked romance rumors in April 2017, and their romance blossomed throughout the year until initial reports began to spread that Jenner was pregnant with their baby. The reality star and cosmetics mogul then welcomed Stormi on Feb. 1, 2018.
For over a year before their split, the pair were continuously the focus of engagement rumors, and took to calling each other "husband" and "wife," prompting many fans to believe that they'd secretly gotten married.
Earlier this year, the pair weathered a supposed cheating scandal when Scott faced rumors and allegations of cheating, which he vehemently denied. By March, it seemed the pair had moved on and their relationship appeared intact.
ET has reached out to reps for both Jenner and Scott for comment.