Casey O'Gorman and Gabby Allen won Love Island: All Stars by less than three percent, it has been revealed. 

The couple managed to storm to victory during the live final on Monday - pipping long-time front-runners Luca Bish and Grace Jackson to the post while Ekin-Su Cülcüloğlu and Curtis Pritchard finished in third. 

But despite emerging victorious, the break down of voting has shown it was a very tight race.

On its official Instagram account, Love Island shared a graph of how the votes were split between the finalists, with Casey, 28, and Gabby, 33, securing the win with just 33.37 per cent of the vote. 

It was less than three percent more than runners up Grace and Luca who finished on 30.38%, while third placed Ekin-Su and Curtis secured 21.74 per cent of the vote.

The results come after some people questioned if the end result was rigged, with Gabby and Casey having been devoid of public sentiment online - as fans cited Grace and Luca's last minute drama surrounding texts alleging she had said she'd do anything to win.

Completing the final vote tally, Catherine Agbaje and Omar Nyame received 8.14% of the vote, while Elma Pazar and Sammy Root finished on 6.36%. 

SlotsCalendar's data revealed that love for Casey and Gabby online ahead of the final was scarce, with only six percent of tweets about them since they paired up positive. 

While social media users were baffled at the result, it has resulted in bookmakers paying out thousands, because of a third of the stakes were placed on the underdogs. 

For weeks, season eight's Luca, 25, and season 11 star Grace, 26, had been the bookies' front-runners to win the show - garnering a strong online fanbase. 

Yet the tide turned on the couple in the crucial few days building up to the final after they were 'sabotaged' by former Islanders. 

During Sunday night's show, the axed stars returned to the villa to decide which couple would be dumped before the final.

Amid their deliberations, Olivia Hawkins set the cat among the pigeons as she claimed to have seen 'secret messages' proving Grace only after a fake relationship.

In a shock outburst, she announced: 'So I've seen text messages of Grace just saying to someone that she'll do whatever it takes to win the show this time from someone back home'.

A horrified Grace denied it immediately and pleaded with Luca: 'Baby, that is absolutely not true. I do not care about winning this show.'

Yet tensions continued as Samie Elishi, who competed with Grace for Luca's affections, also claimed to have seen the infamous messages.  

Grace fumed: 'On my life, I have never written that sentence in my life. It's b******t, and someone's forged that, that's not true. I am gobsmacked'.

Olivia's rival Harriet Blackmore was quick to chime in and told Grace: 'She probably made it up babe, like she did with Ronnie.' 

She added: 'Liv's probably texted herself and used it as an answer. Babe, we all know you wouldn't do that.' 

Following the episode, alleged screengrabs of the conversation began to circulate online but were not verified. 

Back in the villa on Monday for the live final, Olivia was probed about the messages by host Maya Jama, who asked if she had the screenshots to hand.

However, the dumped Islander seemed keen to backtrack after her fiery confrontation with Grace and Luca the day before.

She said: 'I've seen [the screenshots], I've said what I've said. You know me, I'm very straight to the point. I wish them the best.' 

However, showing there was still no love lost between then, Grace took the opportunity to make her feelings clear in response.

She fired back: 'I'm very straight talking too and there's absolutely no receipts so I can't wait to apparently see them.'

As the audience clapped and the tension built, Maya jumped in to joke: 'Ok - you can sort it out online or something.'