Comedian Leigh Francis says fake versions of the charity T-shirt he made following the death of his friend Caroline Flack are being sold online.
The actor - better known as Keith Lemon - accuses other people of "ripping off" his design, which he made to support The Samaritans.
And he's urging websites remove the fakes to make sure as much money as possible goes to charity.
So far, more than 11,000 of his original Be Kind tees have been sold.
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Like everyone I was absolutely shocked by the news of what happened to Caroline. All the recent events just seemed so unreal. I’d been friends with Caroline for many years. Since before telly happened. In more recent times I’d not seen Caroline as much as I had years ago, but it was always like old times when I saw her. I did this t-shirt to spread Caroline’s own words #Bekind, and to raise money for the Samaritans. 100% of profits will go to @samaritanscharity and the link is in my bio or tap the pic. For more information on the amazing work The Samaritans do, or if you are looking for any support, please go to samaritans.org or call them directly on 116 123. Will miss you Flack. Love to your family x
Caroline took her own life earlier this month and Keith had known her for years.
Launching his T-shirt, he said he wanted to spread her #BeKind message - and said all the profits would go to charity.
But fakes have started springing up online.
Radio 1 Newsbeat's found a number of sites selling the fakes - originals can only be purchased through Keith Lemon's own pages.
And the comedian's put out a number of messages on Instagram, urging people not to buy the copies.
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Just wanted to say Fanks so much to every one for buying the #bekind t-shirt 11,280 sold last count. Unfortunately a company called @teespring has stolen the design and has started selling them. That’s profits that would’ve gone to Samaritans. Hopefully they’ll do the right thing and hand over what profits they make to the Samaritans. Can’t trust anyone! Disappointing
"Thanks so much to everyone who's bought a T-shirt for Be Kind. Unfortunately, there's a website called Teespring.com that's ripped off the design and unless they're going to give that money to The Samaritans, then they've stolen my design and taken that money that would've gone to The Samaritans," he said.
He then posted another message to say the company had removed the fakes.
Teespring has since apologised, saying all designs are created by "independent individuals". It also says the user's account has been "disabled" and that it "doesn't support this behaviour".
The company hasn't said whether it'll be handing over any profits to charity - but fakes are turning up on a number of other sites too.
The photo of Caroline that Keith used for inspiration was taken by Rachell Smith.
"Keith is doing a lovely thing here," says Rachell.
"As for any other companies selling a version of this commercially, please respectfully stop."
I have no words our Keith. Shameful 🤬— Amanda & Callum Trowsdale💙 (@amanda_trows) February 25, 2020
Some people/companies have no shame in trying to make a quick buck from other peoples hard work. Especially when it’s for such a great cause. Get the lawyers onto them Keith !— Steven Dodgson (@haribododgson) February 24, 2020
Newsbeat has contacted several of the sites selling fakes but so far, there has been no comment.
If you are affected by any of the issues raised in this article and want help or information you can visit BBC Advice.