Taking to Instagram earlier today, Cally shared a selfie with her co-star beau and the pair couldn't look more loved-up together.
Alongside her photo, she gushed: "When you know you know @luismorrison39."
In her snap, the reality star can be seen nestling into Luis as he puts his arm around her and plants a kiss on her head.
Fans of the couple (dubbed 'Calu') were quick to comment on the picture, telling Luis and Cally they made a perfect pair. N'aww!
Cally's caption isn't the first time that the besotted couple have hinted at a long future together, as the pair were often seen talking about marriage while starring on Love Island.
When asked by her islanders if she thought she would marry Luis one day, the starlet didn't hesitate in saying yes.
Luis, meanwhile, told his girlfriend she is the "love of his life".
Romance blossomed for the couple shortly after Cally entered the Love Island villa. The boys had been giving the opportunity to pick a new girl to join them and on seeing Cally in the line-up, Luis persuaded his co-stars to choose her for him.
Following her late arrival, the pair had been inseparable and have continued to be so, since finishing fourth on the show.
Last week, Cally joined Luis in London as they celebrated his 21st birthday together, before reuniting with their fellow Love Island stars.
They aren't the only couple giving their relationship a go on the outside, as a handful of others have been spotted looking pretty loved-up since jetting home from Majorca.
Future 'Mr and Mrs' Hannah Elizabeth and Jon Clark have been busy toasting their engagement and Zoe Basia Brown has been meeting boyfriend Jordan Ring's parents.
Love Island winners Max Morley and Jess Hayes have seemed pretty smitten, recently reassuring fans they are still very much together, despite a minor fallout over the weekend.
Check out all the snaps from Love Island's wrap party below:
Copyright: Instagram @jbclark_
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