Bride has horrifying three-word response after seeing groom at the altar for the very first time

A bride had a horrifying response to seeing her husband for the very first time at the altar after he pulled one hell of a prank on her.

If you didn't know what your future husband or wife looked like and they didn't know what you looked like either, you'd want to make a good first impression... wouldn't you?

Well, Married at First Sight UK (MAFS) contestant Kieran clearly didn't get that message as he decided to pull a prank on his future sweetheart. Take a look:

For those not in the know, MAFS sees a bunch of couples 'marry' on the day they meet each other after being coupled by a group of experts. They will then spend weeks living together and seeing if they can make their relationships work, before making the ultimate decision at the end of the social experiment whether or not they want to stay together.

Anyway, Kieran thought it'd be a hoot to purchase a set of fake teeth and don them at the altar to truly test his new wife - dog walker Kristina.

Kieran, at least get to know the woman first before you start doing stuff like this!

Well, the 28-year-old mechanic knew better as he explained the reasoning behind the prank to the Channel 4 film crew.

"This could really end up bad, but I just want to know if this girl is funny," he said.

Mechanic Kieran won over Married at First Sight viewers with a string of hilarious pranks (Channel 4)

As Kristina walks down the aisle, he slowly turned around with a grin on his face revealing two prominent yellow, dirty, goofy teeth with several others around them.

Would Kristina approve of such a prank at her wedding? Well, almost bursting into tears, the 30-year-old says: "Oh my god!"

I think we'd all respond with those three words.

He responds: "You alright? You okay?"

She then can be heard saying: "These teeth. What the f**k!"

It's the first time I've seen anyone pull a prank like this on MAFS before, but I've not watched every single season from the US, UK and Australia - which I have to add, the Aussies are the absolute GOATs when it comes to the reality TV show.

But Kieran didn't stop there, as after they gave their vows to each other, the menace turned things up a notch.

Poor Kristina walked down the aisle on her big day to find her husband donning fake teeth (Channel 4)

He wrote a song for his new wife, but she'd soon discover that he was no Jon Bon Jovi, as he began belting out disgusting lyrics which included him taking a sh*t on her.

Horrified viewers took to Twitter to discuss what they'd just witnessed, with one user writing: "Did Kieran just say that she could take a sh*t on his chest in a song?"

While another asked: "Why is he singing a song about sh*tting on his wife’s chest to the whole reception?!"

So... did she leave him at the aisle?

Amazingly not, as she was actually charmed by Kieran - who I will add won over the viewers with just how funny he is.

She told her mom that she actually 'really liked him', and later said she was ready to move into his static caravan with him.

Let's hope Kieran and Kristina stand the test of the MAFS time!