Simon Cowell has pledged £50,000 to help a four-year-old boy get life-saving cancer treatment in the US.
The music mogul has donated the huge sum towards Zac Oliver's overall target of raising £500,000 so he can receive treatment for Near Haploid, which is a rare form of leukaemia.
In a video urging other people to support Zac, Simon - who has a four-year-old son called Eric with his partner Lauren Silverman - said: "This boy is four years old and needs money to get him to America to get the help he needs.
"So I want you please to go on Zac Oliver's JustGiving page and whatever you can donate will make a difference.
"And because I don't like well-known people telling people to do something and don't do anything themselves, I'm going to donate £50,000. We're going to get there."
Treatment for the illness is not currently available on the NHS.
But Zac's mum, Hannah Oliver-Willets, has thanked the "X Factor" judge for his support.
Reflecting on his generosity, he said: "Thank you, Simon Cowell.
"I explained to Zac that Simon has helped to pay for his special medicine.
"Zac said "thanks Si", LOL. Little does he know how much closer we really are to getting him to the US."
Meanwhile, Simon previously admitted that parenthood has changed his outlook on life.
He shared: "It gives you such a different perspective on life. Things that I thought were important, just aren't.
"Because I see a lot of things through his eyes now, I find everything to be a happier place."