Kerry Katona has revealed that she felt 'heartbroken and mortified' at her body while filming E4's The Big Celebrity Detox, which began airing last week.The TV personality, 42, faced her insecurities on the show with a 'mirror challenge' - which prompted the celebrity participants to stand nude in front of a mirror and embrace their natural bodies. She and Ibiza Weekender star David Potts initially refused to take part in the activity, but eventually, they both relented and joined in. Admitting that she wasn't in a headspace of acceptance at the time, Kerry said: "I wasn't comfortable then at all, I was heartbroken and mortified of myself.