Published Monday, 14 September 2009
The presenter caused a sensation by wearing a white gown with a plunging neckline on the celebrity ice-skating show last year.
The 28-year-old said the outfit had been the cause of anxious dreams as she geared up to replace Fern Britton on the flagship daytime show.
"I dreamt the first item on the show today was a dress comparison, where I had to bring in the dress from Dancing On Ice and wear it again," she said.
"It was a 'before and after' breastfeeding comparison, so everybody was just staring at this area (pointing to her chest), saying 'They're not like that anymore now she's had Harry', and I was thinking 'I don't want this job any more'."
As the cameras rolled on, co-presenter Phillip Schofield - who hosted Dancing On Ice alongside Willoughby - jokingly pretended to walk off the set.
She said the night before the show had been like Christmas Eve: "that horrible but brilliant excitement where you can't sleep".
Britton announced in March she was leaving This Morning after 10 years on the famous sofa, saying she wanted to work on other projects and spend more time in her garden.
Her last show came on her 52nd birthday in July, when former presenters and guests appeared to bid her farewell.
Britton rejected rumours that she quit the show after falling out with Schofield because he was being paid more than her.
For months, speculation over who would replace her was rife, with names including Myleene Klass, Melanie Sykes and Kate Garraway all mentioned.