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The 28-year-old, who was coupled with the hunk during the 2020 series, took to her Instagram Stories and shared a hysterical clip as her mouth hung open in absolute shock.
The pair were originally favourites to win, but broke up and quit the show just days before the final after Movie Night revelations rocked their romance.
Hannah was a contestant on series one of Love Island back in 2015 where she finished as runner-up with Jon Clark who proposed to her in the villa.
For the first time in the show's history, singletons from previous seasons returned to the villa as they continue their quest to find their dream partner.
Love Island exes Callum Jones and Molly Smith were revealed as ITV 's new All Stars show's first two bombshells in the first episode. This comes just six months after the end of a three-year relationship.