But their reunion didn't end there! Kendall was spotted leaving Harry's After Party at the Moxy Hotel Rooftop in NYC.
According to sources, the former flames were the absolute last people to leave the party, exiting seconds apart after the sun had already risen.
The Keeping Up With The Kardashians star was photographed hiding her face as she walked towards her car.
Other celebrities believed to be at the party include Gigi Hadid, Katy Perry, Dua Lipa and more.
Could Kendall and Harry be more than just friendly exes? The pair reportedly spent over four hours together at the party after Kendall's friends has left.
It is not known whether they left in the same car, or separately.
However, Kendall has most recently been linked to NBA star Ben Simmons.
Flirting or just friends, the Met Gala was the first time in five years that the former couple had been photographed interacting together at an event.
Kendall attended the event in NYC with her sister Kylie Jenner. See their full outfits here.
WATCH: Kendall Jenner arrives at the 2019 Met Gala