One Married at First Sight UK episode turned into chaos when groom Kieran performed a song about his new wife Kristina leaving their family and friends stunned on their wedding day. The wild social experiment from E4 made its return to the nation's televisions on Monday, featuring 16 singles ready to wed a complete stranger. Newcastle mechanic Kieran and dog walker Kristina were matched by relationship experts Paul C Brunson, Mel Schilling, and Charlene Douglas, striking it off immediately upon their first encounter.

Prior to their marriage, Kieran decided to showcase his mischievous side with a daring stunt, sporting a set of wonky 'false' teeth as Kristina approached the altar. Initially, Kristina seemed unimpressed by her husband-to-be's joke, audibly commenting, "These teeth. What the f**k? ", reports the Mirror .

Concerned he might have pushed the envelope too far, Kieran confessed: "I think the teeth could make us look a little bit immature. I'm a little bit nervous to see how it goes." But Kristina was eventually overcome with laughter, which Kieran took as a sign that his unconventional choice had been worth it.

The madness didn't stop at the ceremony, as Kieran prepared another surprise for the reception. When everyone gathered for the wedding speeches, Kieran revealed his keyboard and announced he had penned a special song for Kristina. As Kristina tuned into Kieran's words, the atmosphere quickly spiralled into the realm of the unexpected when he launched into a fo.