The relationship was first reported on in May, after Jenner's split with basketball star Blake Griffin, and was confirmed at the Kardashian's 4th of July party.
However, due to their work commitments, the two have reportedly been drifting apart.
"Kendall and Ben's relationship is fizzling and dissipating due to scheduling conflicts," a source told Us Weekly. "Kendall is so busy and has so much going on and doesn't want to wait around for anyone."
Now it looks like the model has taken to the tattoo parlour following the split. In an Instagram story, Jenner flashes what looks like a brand new tattoo on her right rib, which reads 'baby'.
Jenner has previously been open about the ink she regrets, telling Ellen DeGeneres that getting 'Meow' on her inner lip was a drunken mistake.
"I was drunk. I was not thinking," she said at the time.