Kerry Katona has admitted she feels "very sad" about her Atomic Kitten days. The former pop star, 45, shot to fame alongside Liz McClarnon and Natasha Hamilton as part of the girlband in the late 1990s, but left just before they released their signature hit Whole Again. Jenny Frost took her place in the group, and they remained active until 2003. In the years that followed her initial stint, Kerry became a TV favourite, winning I'm A Celebrity...Get Me Out Of Here! and famously fronting adverts