It comes after the star was flooded with Birthday wishes after the star turned 44 years old on Monday.
Holly, who commanded attention in an all-black ensemble, explained adventurer Bear Grylls, 50, even got her involved in some challenges throughout filming of the programme which sees him chase 12 celebrity contestants across the wild terrain.
Holly Willoughby turned up the heat with her latest Instagram post on Wednesday.
The presenter has only appeared on the new show for a total of 24 minutes across the seven hours of the show.
Among the famous pals to wish Holly a happy birthday was Canadian singer and TV host Nicole Appleton.
