The former Gogglebox star, 29, featured on the professional ballroom dancer's Instagram Stories as he announced the collaboration.
Speaking from a backstage area at MediaCity, near Manchester, 23-year-old Curtis told his fans: "I am filming for something... I can't say what it is yet."
Scarlett appears in the frame dressed in a pink shirt with black polka dots.
As reported by Metro, she later told her own followers that the pair were working on a charity project together.
I am filming for something... I can't say what it is yet.
Both Scarlett and Curtis have nabbed big TV roles since moving on from the reality TV shows that made them famous.
Shortly after departing from the Love Island villa in July, Curtis landed a role on the new series of The Greatest Dancer.
Scarlett, meanwhile, has worked on a number of TV shows since leaving the Gogglebox line-up in 2016, including a presenting gig on I'm A Celebrity... Get Me Out Of Here! companion show Extra Camp.
She announced in July that she would be leaving that job after three years, before revealing details of a bizarre new programme she's set to star in alongside her mum and dad.
The telly favourite's home is being transported all the way to a remote African village for The British Tribe Next Door.
It will see Scarlett and her family taking part in a unique culture clash and month-long learning experience, when an exact replica of their semi-detached home is built in Namibia near a settlement occupied by the nomadic Himba tribe.
Scarlett said of the show: "This is one of the most eye-opening experiences of my life."
Speaking further, she said she feels "privileged and humbled" that members of the Himba tribe invited her family to join them, admitting she has learnt "an enormous amount".
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