Katie, 36, donned a pair of sexy white stockings, a white leotard with plunging neckline and the world's hugest veil-come-feather-creation to promote her new read.
Standing with her hands on her hips, the star - who only gave birth to daughter Bunny in August - clearly wasn't lacking confidence when it came to her post-baby body.
Katie's husband Kieran Hayler was clearly feeling camera shy, however, as he waited in the wings at the London studio and looked after Katie's children - Junior and Princess - along with Bunny and son Jett.
Despite the cover, Katie's new book, May Your Wish Come True, focuses on the life of a showbiz journalist - not a bride - meaning Katie's outfit choice could also refer to her private life.
Although the star insisted to waiting press that her ensemble was "Christmas-themed", it definitely looks wedding-y!
In May, days after unexpectedly discovering she was pregnant with Bunny, Katie learned her husband Kieran had been cheating on her with her now-ex best friend Jane Pountney.
However, after initially declaring that she would be filing for divorce, Katie decided she wasn't going to give up on her marriage and the couple have been working on their relationship.
Kieran gave up his part-time stripping job and, Katie says, has been receiving therapy for a 'sex addiction'.
Last month, it was revealed the former glamour model has decided to renew her wedding vows to Kieran before the year is out. Katie recently attended Kerry Katona and George Kay's wedding, and it made her want to "do it all again".
Katie is now planning a blowout do for herself and Kieran - which is no doubt why she decided to dress up as she did today. Something tells us this won't be the outfit she will be wearing though...
Katie's craziest costumes: