The This Morning presenter is swapping the studio sofa for live Down Under as she prepares to host the popular jungle show with Declan Donnelly.
Willoughby, 37, was all smiles as she walked around in the capital on Thursday, already in holiday mode with Ray Ban sunglasses.
Just yesterday, Willoughby said goodbye to her closest friends as she gets ready to jet off for her three-week stint, showing off a good luck cake made for her.
Posing next to the chocolate dessert, Willoughby wrote: “Mmmmmm yummy .... my girls know what I like... thank you beautiful ladies @ruby1kid @shishib #nikidemetz and @emmaleebunton.”
It has also been claimed that the star is stepping up to the plate as a “favour” to her long-time friend McPartlin, who quit his TV commitments earlier in the year .
“Holly's so good at what she does, she'll be amazing, and I'm looking forward to it.”
Fans are already on tenterhooks as they wait to find out the famous faces taking part in this year’s series, which kicks off next weekend.
I’m A Celebrity returns Sunday November 18 at 9pm on ITV.