Love Island: All Stars winner Gabby Allen showed off her incredible body transformation in jaw-dropping before and after snaps on Tuesday.

The personal trainer, 33, - who just won the show with her partner Casey O'Gorman - shared some fitness inspiration with fans.

In the before picture she wore a red top and denim jeans, while the after snap showed her flaunting her abs in a tiny bikini.

She posed confidently as she promoted her fitness business which she launched after her first run on Love Island.

Gabby penned in the caption: 'Some of you may know my story already, I appreciate you for being here, but to anybody who is new here and fancy a little story time, put your feet up, pause ya tele and give it a lil read if you fancy.

'&& this is just the short version of the story... but yeah it's been a rollercoaster. I am so happy with where I am today and what I am doing with my life - I get to work with you amazing women!!! 

'I don't really share things like this but I was so humbled coming out to so many lovely comments about my time on Love Island and sooo many enquiries about training with me Im overwhelmed. Thank you.

'I thought I'd share with you my little journey to give you a little insight to how much my life and my prospects have changed over the years! All thanks to being flat broke on my ass, a PT course and of course, Love Island!!

'At the beginning and end of it all, my passion is you. Helping women like you get to where they wanna be too. I am so grateful i get I do a job I love, that is so rewarding and inspiring.

'I have been working on special something for you guys before the villa and I'm finishing it up as we speak! Make sure you have put your name down so you are the first to know when it's available.

'I promise you, as long as you put the effort in too, with my guidance, you can get results you've always dreamt of!'

In the next slides she shared her journey, from being unhealthy in her younger years to getting on top of her fitness.

It comes after Gabby and Casey 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 last 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 and Casey, 28, were pictured packing on the PDA as they shared a smooch outside the lavish restaurant.

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 last 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.