The dynamic duo gave the money after hearing warm-up man Ian Royce was in trouble.
The Mirror reports that Ian, 50, worked on both BGT and The X Factor and is claimed to be good friends with the pair.
But when he suffered a brain aneurysm when drunk, he asked for £20,000 to go to famous rehab centre The Priory to help sort out his problems.
It's claimed that Ant - who has battled his own demons in the past year - and Dec pledged thousands on Ian's GoFundMe page.
The page - set up by a friend - said: "Ian is in desperate need of our help. He is an alcoholic and has taken his first steps by admitting so."
Finding out what’s in store and this years celebs.
Thanking Ant and Dec on Twitter, Ian wrote: "Thank you Ant for your generous donation for getting me well..Amazing @antanddec xxx.
"Thank you Dec as well for your donation..Love you @antanddec."
Thank you Dec as well for your donation..
Love you @antanddec
— Ian Royce (@officialroycey) September 30, 2019
The boys recently shared a selfie from a production meeting at ITV for the new series.
The pair shared the snap, which showed them with excited expressions in front of screens and laptops with the I'm a Celeb logo on.
They captioned the image: "At @itv having meeting about @imacelebrity. Finding out what’s in store and this years celebs...."
Elsewhere, Ant and his girlfriend Anne-Marie Corbett are reportedly about to take a huge step in their relationship.
Ant will be heading back to I'm a Celebrity after missing last year's series as he battled alcohol issues and prescription drug addiction, and Anne-Marie will reportedly be joining him.
According to reports, the presenter wants his 43-year-old girlfriend - who is also his sober coach - by his side while he films in Australia.
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