Willoughby treated herself to a spot of sunbathing on Monday after wrapping up the first episode, telling fans she was stocking up on her “vitamin D ...”
The This Morning presenter shared a smiling selfie from a sun lounger as she propped herself up on a striped towel.
Fans encouraged her to enjoy the “relaxing” break as they praised her “fantastic” first night with Donnelly.
Willoughby said she was “overwhelmed” to be on set and “massively relieved” for it to be over.
Speaking on Extra Camp she said: “It’s just so overwhelming this show. You watch this on telly- this was part of my life for years and suddenly I’m here. It’s surreal.”
Donnelly revealed Willoughby had been in tears after he first showed her the “magical” camp ahead of welcoming 10 terrified celebs into their new home on Sunday night.
The group were divided into two teams and pitted against each other in a battle to make it to camp first.
They were tasked with collecting flags above a 100ft cliff edge drop, skydiving, driving through hell holes and making their way across a lake to grab their jungle garbs.
The stress became too much for Anne Hegerty who broke down in tears over fears she couldn’t cope after her team lost the challenge and were sent packing to the less luxurious Snake Rock.
Other stars taking part include Fleur East, Emily Atack, Rita Simons, James McVey, John Barrowman, Nick Knowles, Harry Redknapp, Sair Khan and Malique Thompson-Dwyer.
Atack was chosen by the public to take on Vipers Pit – the first Bushtucker Trial of the series. Hegerty was ruled out on medical grounds.
I’m A Celebrity is on ITV, tonight at 9pm