The duo, who came second place to Gabby Allen, 33, and Casey O'Gorman, 28, who scooped the £50,000 cash pot and ITV2 matchmaking show title, headed out for a swanky dinner.
And they couldn't have looked looked more loved-up on their night in London, with Grace perching on 25-year-old Luca's knee as he nuzzled into her neck.
Model Grace, also 25, wore a stunning semi-sheer black lace dress with black bra and knicker detailing.
She kept her make-up natural to show off her South Africa sun tan to best effect, bar a slick of black mascara and pink lip gloss.
The Manchester lass pulled back her blonde locks into a stylish up-do to complete her look
Grace - who first found Love Island fame in 2024 - uploaded the snap taken at a London eatery to her Instagram page with the words: "Finally got our date."
She rounded off her message with a white love heart.
The caption could have been a cheeky reference to their time in the All Stars villa - where Luca was whisked on a date with bombshell Samie Elishi.
Yet Grace didn't get a chance for a date with her man until they returned to the real world.
Their co-star Omar Nyame was quick to comment on the snap: "Yeaaaa my boy."
One fan then put: "The cutest ever."
A second put: "The most beautiful, Barbie & Ken."
Luca's sister Claudia then sparked a slew of positive reaction when she wrote: "Welcome to the family our gorgeous girl."
