The X Factor pair were made to eat stomach-churning dishes for charity during the variation on I'm a Celebrity's famous Bushtucker trials.
The Christmas-themed menu included pigs in blankets made from pig penises, a dessert of sheep brain mince pies (wince pies) with a side of sheep eyeball ice-cream, and glasses of rotten eggnog.
Ant & Dec enjoyed their hosting duties, while former I'm a Celebrity contestants Shaun Ryder, Rosemary Shrager and Made in Chelsea's Hugo Spencer took glee in serving up the dishes.
Putting a brave face on it, Clark said of eating the sheep brain mince pie: "I might get a bit more intelligent!"
He was later heard saying backstage that he had "willy stuck in... [his] teeth".
Walsh and Clark managed to finish all the food served to them, raising £100,000 for Age UK, Carers UK, Whizz-Kidz, Together for Short Lives, Marie Curie Cancer Care and Anthony Nolan.
Gallery - celebrity Christmas cards for Text Santa: