Prince William was said to be "copying everything Harry and Meghan do" as part two of his TV documentary We Can End Homelessness aired on Thursday evening.
Furious viewers stepped in to defend him from the accusation after claims the royal was "copying" his brother, Prince Harry, and wife Meghan Markle's philanthropic efforts.
One critic took to X, formerly Twitter, and suggested that Prince William had launched the Earthshot Prize to go head-to-head with Harry's charitable efforts including the Invictus Games - adding the future king was "copying" with his younger brother with his latest initiative to end homelessness too.
Royal fans passionately defended him against the backlash this evening, as one supporter fumed: "The irony of people accusing William of using Princess Diana for his homelessness initiative. UM HELLO THIS IS EXACTLY WHAT DIANA WOULD WANT HER NAME TO BE USED FOR."
They added: "The world constantly uses her to feed drama while her elder son is out there using her name to help people."
Another chimed in: "Princess Diana would be so proud of her firstborn son. No drama, no victim narrative, just honouring her name following what she taught him as a kid. To help people."
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Another argued: "#PrinceHarry has always defended his mother & says he lives his life & does his work based on what she taught him. #PrinceWilliam never did, until this year. He's using #PrinceDiana's image & name" but a royal fan fired back,"This is what Princess Diana would have enjoyed most!"
They added, "The first born of her first born. William has certainly surpassed any expectation she would have had of him."
The royals, including William, Harry and Meghan are known for their charity work and raising awareness for issues that impact society.
Meanwhile, an emotional Prince William addressed how his late mum might have felt about him taking on the challenge of eradicating homelessness during tonight's offering.
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"She'd have thought I was mad to start off with!" he quipped.
However, hinting that the trauma of losing her at a young age had helped him to feel compassion for people's suffering, he continued: "When you feel a human connection with someone who's been in deep trouble, I challenge anyone not to feel a desire to help."
He added: "What I want to see and what I think she would want to see is action, movement and change."
William has now pledged his desire to end homelessness within five years.
