Gabby Allen and Casey O'Gorman put on a very loved-up display as they enjoyed a surprise welcome home party at celebrity hotspot Sheesh in London on Friday.

The couple were crowned winners of Love Island: All Stars on Monday night and took home the £50,000 cash prize, and still appear to be going strong outside the villa.

After jetting back from South Africa, Gabby, 33, and Casey, 28, were pictured packing on the PDA as they shared a smooch outside the lavish restaurant.

Gabby put on a very busty display in a lace-up leather top and a matching belt mini skirt, which she styled with an edgy leather jacket.

She showed off her toned legs in a pair of black heeled boots and toted her essentials in a small shoulder bag with a gold chain strap.

Gabby walked hand-in-hand with Casey, who cut a smart figure in a white shirt and wide-leg grey jeans, which he styled with a pair of smart loafers.

The couple appeared to be in jovial spirits as they flashed huge smiles and couldn't keep their hands off each other as they flaunted their affections.

Later taking to Instagram Gabby explained that she thought they were just going on a double date with close pals and last year's winners of Love Island: All Stars Tom Clare and Molly Smith. 

However when they got there she was surprised by a big party with all her friends and family. 

Sharing a snap with fellow islanders Tina and Danielle she wrote: 'Omgggg my bezzies are here too wtah is going on!!!!' 

Meanwhile Molly, 30, looked sensational as she flaunted her toned abs in a cut out black dress that also gave a hint of her ample cleavage. 

Holding hands with Tom, he kept it casual in a pair of faded blue jeans and dark grey T-shirt. 

The group were also joined by Gabby's brother Ethan and his girlfriend. 

The show's runners up Luca Bish and Grace Jackson didn't join the party as they were seen enjoying dinner with friends elsewhere in the capital. 

Gabby and Casey won the second series of Love Island: All Stars by less than three per cent.

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 and Gabby securing the win with just 33.37 per cent of the vote.

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

Some fans even 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 per cent of the vote, while Elma Pazar and Sammy Root finished on 6.36 per cent.

For weeks, season eight's Luca and season 11 star Grace 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.