This secured her an agent who then contacted the BBC.
Willoughby presented CD: UK for a short while in the spring of 2005, replacing Cat Deeley before Myleene Klass became the regular presenter.
In 2006 she was chosen to co-present with Phillip Schofield, the television show Dancing on Ice, where celebrities are partnered with professional dancers to learn ice-dancing routines which are judged by a panel of experts and voted on by the public.
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Since 2008, Willoughby has appeared as a team captain on Celebrity Juice, presenting series 1-11 and 13 (taking a break in series 12 due to maternity leave) Willoughby and Schofield present the programme from Monday to Thursday mornings with Ruth Langsford and Eamonn Holmes co-hosting on Fridays.
In 2011, Willoughby co-presented charity telethon Text Santa with Ant & Dec.
Willoughby remained in the role until 2011 due to new commitments.
Willoughby has presented a number of other ITV programmes, including spin-off shows such as Celebrity Wrestling: Bring It On in 2005, Greased Lightnin' in 2007 and The Xtra Factor for two years in 20.
She has also had a number of minor appearances on other children's programmes.
She co-presented the final of the children's version of Stars in Their Eyes in 2004.
In 2006, the show's title was changed to Holly & Stephen's Saturday Showdown in order to reflect the popularity of its co-presenters, Willoughby and Stephen Mulhern.