In the black and white photo, Thor - real name Hafþór J Björnsson - is seen clad in a dapper suit and tie, while Kelsey makes the picture perfect bride in an understated bridal gown.
She too was seen confirming news the couple had tied the knot via her own account on the social media platform and said: "Looking forward to pulling this big guy around for the rest of my life.
"I love you now and forever and promise to stand by your side through all that life throws at us. I love you baby!"
Kelsey shared another snapshot from the pair's wedding that saw her holding the hand of her husband after saying "I do".
Thor and Kelsey have been dating since 2017 and met in Canada in a bar where Kelsey was working as a waitress. It's claimed Kelsey, who stands at 5ft2 while her beau reaches 6'9, asked Thor for a picture and romance quickly blossomed between the pair.
The couple have garnered much attention, thanks to the height difference between them, with Iceland-born Thor revealing that he has been trolled because of it.
Despite his gigantic stature and monstrous size, Thor revealed that he is still subjected to online trolling, with many targeting his relationship with pint-sized Kelsey.
According to The Mirror, the actor explained: "I don't get people asking me to fight face-to-face but there's a lot of brave folk on the internet. No one has ever threatened me in real life but on Facebook and Twitter it's all the time."
When asked the rather personal question about how the couple kissed, Kelsey stepped in to answer. Kelsey joked: "He bends, I tiptoe. Or just say, 'Screw it, pick me up."'
Thor added that he is not easily offended unless it comes to people talking about his family.
He bagged the role of Gregor Clegane, nicknamed The Mountain That Rides in 2013 and is the third person to play the role in the infamous knight.
The former basketball player boasts a number of impressive sporting accolades, including the Arnold Strongman Classic, Europe's Strongest Man and Worlds Strongest Man.
