Katy Perry is backing a fundraiser for a young boy with a degenerative disease.

The 'Firework' hitmaker's heart was ''touched'' by the plight of six-year-old Carter, who is suffering from progressive brain disorder Sanfilippo Syndrome, which is often referred to as Childhood Alzheimer's and will see him eventually lose the ability to walk, talk or swallow, as well as have seizures and suffer dementia, and urged her fans to donate to a fundraising campaign for a clinical trial.

She posted on Twitter: '' My [heart] was touched by Carter's story. If you're able pls help w/ his chance to defeat Childhood Alzheimer's. He's SO close to funding his clinical trial & I would love to see my KatyCats kick it over the goal & make that difference! I'm donating now too! https://www.gofundme.com/savingcarter (sic)''

A donation for $1,000 is listed on the page in Katy's birth name, Kathryn Hudson.

The youngster's parents, Jen and Samir, are aiming to raise $1 million in a month in order to fund the trial and, at the time of writing, they have received donations totalling over $983,000.

On the GoFundMe page, Carter's mom wrote: I'm Jen, Carter's Mom. My son is dying. There's no other way to say it. My beautiful, perfect little boy...is dying. As I lay him down to sleep each night, my tears overflow, and a deep aching is in my heart at the reality of losing my child. There is only ONE THING that can change his fate, and we are asking for your help. We are asking you to help save Carter. ..

''At age 6, Carter is starting to show the signs of the disease. Right now he can still talk, some. He can still run and play with his big sister Sophia. For now, he's hanging on, but just barely. This campaign for his LIFE is as urgent as it gets. It's Now or Never for Carter.

''Our #1 goal is to raise $1 milllion dollars in 1 month, to give Carter his rightful chance at LIFE. We can't just sit back and accept that he's going to fade away and die, not when there is something tangible that could save him. The $1M will go to fund a clinical trial that can give him that chance.

''The love for a child is like no other.

''''If you are a parent, you know you would 'go to the ends of their earth for your little ones.' We are asking you... will you please go there with us now, for Carter?(sic)''