The TV star recently participated in ITV's Shark! Celebrity Infested Waters, which involved swimming with sharks in the Bahamas.
Riley, who was a contestant on the 2013 series of Strictly, found the pressure from the judges and viewers more terrifying than facing sharks.
She previously disclosed that her experience on Strictly Come Dancing led to post-traumatic stress disorder, for which she received cognitive behavioural therapy.
Despite the challenging experience, Riley acknowledged that meeting her now-husband, professional dancer Pasha Kovalev, was the positive outcome of her time on the show.