Game of Thrones' The Mountain and wife announce they're having a boy

They're expecting a boy! [Photo: Instagram]

Hafþór Júlíus Björnsson - who played Gregor "The Mountain" Clegane on Game of Thrones - has revealed that he and wife Kelsey Henson are expecting a baby boy.

The couple, who tied the knot in 2018, made the announcement on Instagram in the cutest way possible.

"Swipe right to see the gender of the mini-me!" the strongman wrote, alongside a series of photos.

In the first, Hafþór, 30, goes to pop a balloon with a pin, the next revealing blue confetti - revealing they're expecting a boy.

Read Also: Game of Thrones producer apologises over ‘stray’ Starbucks cup

The final snap shows the two sharing a loving kiss.

The 6'9" actor and bodybuilder married 5'2" Kelsey, 30, in October 2018.

Hafþór is known best for his portrayal of the villainous Mountain on Game of Thrones - he met his end during 2019's series finale, when he plunged to a fiery death.

He already has a daughter, Theresa, from a previous relationship.

Hafþór and Kelsey are currently self-isolating in his native Iceland amid the coronavirus outbreak.

His social media reveals that he hasn't let lockdown slow his progress in the gym, lifting unbelievably heavyweights as if they were nothing at all.

Kelsey's into her fitness too, regularly sharing her workouts with fans.

Read Also: Game of Thrones producers planned to 'brutally mutilate' Jon Snow in battle

She's also been dishing out advice on how to keep fit during lockdown with helpful videos.

One was captioned: "Now that many gyms have closed, home workouts are the next best thing!

"I teamed up with @transparentlabs to bring you this total body at home workout that you can complete with just a resistance band."