Khloe Kardashian commented "I love this" while a friend of the reality star, Simon Huck said, "there he is!" with a red love heart and fire emoji.
Fans were also quick to take to the comment section with one saying, "finally" while a second commented, "Seriously loving them together."
Rumours started swirling about the pair last year after the reality star appeared on Saturday Night Live where she shared a kiss with Davidson.
They were soon spotted hanging out at an amusement park and holding hands before it was confirmed in November by a source close to the mum of four that they were casually dating.
The source told E! News at the time, "They are really happy and seeing where it goes." Since then the two have been seen together frequently and even took a trip to the Bahamas together at the start of the year.
Kardashian's post comes after she was declared legally single by the courts after filing new documents in her ongoing divorce from Kanye West.
The business mogul claimed the rapper's public outbursts were creating emotional distress.
"Kanye has been putting a lot of misinformation regarding our private matters and co-parenting on social media which has created emotional distress."
She then stated, "I ask that the court restore me to the status of a single person so that I can begin the healing process and so that our family can begin the healing process and move forward in this new chapter in our lives."