On Air Now
The Smooth Late Show with Martin Collins 10pm - 1am
7 December 2018, 14:04
This is what happens after eating nothing but rice and beans and taking part in gruelling trials for pretty much three weeks.
From football legend Harry Redknapp to actor John Barrowman, this year's crop of celebs have seen quite the transformation.
See the amazing before and after photos of the 11 stars below: