Gabby Allen and Casey O'Gorman shared a cheeky smooch as she celebrated him completing the London marathon on Sunday.

The former Love Island stars won the ITV show earlier this year and have grown from strength to strength as they have spent the last few months traveling the world and attending glitzy events. 

And now the blonde gym influencer, 33, shown up in support of her recently confirmed boyfriend, 28, as she waited at the side lines to motivate him with a kiss.

Casey looked delighted to spot his girlfriend in the crowds as he ran over over to the barriers and embraced her in a public display of affection. 

The All Stars winner completed the 42.2km in an impressive three hours 41 minutes as he managed to average a pace of 5.15km/h for the race. 

Gabby shared their sweet moment to her Instagram stories and confessed she was 'so proud' him.

Her post comes after she recently clarified her relationship status on her Instagram stories after speculation about her jetting off alone to Dubai.

She quipped in a holiday clip: 'Side note: Yes believe it or not, a girl can go on holiday with her family without it meaning her and her fella have ended... he's flying out on Sunday to see me.'

The couple bagged the whopping £50,000 prize after they won the Love Island spin-off.

Casey finally got his happy ending with blonde bombshell Gabby after appearing on the show three times previously.

The couple had flown under the radar in the lead up to the finale, with bookmakers never placing them as favourites to clinch the prize.

Nonetheless, they managed to storm to victory during the live final - pipping longtime frontrunners Luca and Grace to the post while Ekin-Su Cülcüloğlu and Curtis Pritchard finished in third.

Some even questioned if the result was rigged, with Gabby and Casey having been devoid of public sentiment online - SlotsCalendar's data revealed that only six percent of tweets about the couple since they paired up had been 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.

William Hill spokesperson Lee Phelps told MailOnline: 'Gabby and Casey’s Love Island All Stars victory last night may have appeared a shock on paper, but the result ended up being a big loser for us.'

He continued: 'The couple accounted for over a third (35 percent) of stakes throughout the series.

'While the pair started out as an unlikely 10/1 towards the end of January, our punters appeared to have their heads turned in early February and their price dropped to as low as 4/7 at one point – the shortest odds offered at any stage of the series.

'Gabby and Casey entered last night’s finale as 6/4 second favourites but proved to be the real bombshells of the series, stealing the crown from Luca and Grace (1/2).'

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