EXCLUSIVE: Meghan Markle Accused of 'Vulgar Act' at Princess Diana's Grave

Prince William was left "enraged" after Meghan Markle controversially posted an Instagram photo of her family on their way to visit the gravesite of her late mother-in-law, Princess Diana, RadarOnline.com can exclusively reveal.

The snapshot generated widespread horror among royal fans, who felt the private moment should never have been made public, and Diana's firstborn and their heir to the throne found Markle's alleged "publicity grab" a "vulgar" act, insiders claimed.

Markle took the picture on the Sussexes' recent trip to the U.K, where she and husband Prince Harry had a brief meeting with his father, King Charles III, and his wife, Queen Camilla.

The monarch also reunited with the couple's two children, 7-year-old Archie and 5-year-old Lilibet, for the first time in four years.

While in England, the family slipped away to Diana's ancestral estate, Althorp, where she's buried on a private island in the middle of a lake on the grounds. Markle shared a snapshot of Harry and Archie walking ahead of her, carrying extra-large floral bouquets, while Lilibet held a smaller bouquet.

"The fact they shared a photo of the children on the grounds of Diana’s family home has enraged William, and he says it’s so obvious it was done to get headlines and that sickens him,” an insider spilled about Markle's stunt.

"He doesn’t have any objection to Archie and Lilibet paying their respects to their late grandmother. But in his view, to turn it into a publicity grab is just vulgar and beyond disrespectful, and he’s incredibly sad that they would stoop this low," the source continued.

“He finds it very hypocritical. This proves nothing has changed, and he’s not the only one who sees it this way," the insider dished, referring to the rumors that William and others inside palace walls believe the Sussexes may be using their royal connections for attention or financial gain.

Harry and Markle quit their royal duties in 2020 and have been distanced from some of their family members ever since. However, they continued to use their titles in interviews, slamming the firm, and cashing in on ventures with Netflix and Spotify.

Speculation was rife that the Sussex family trip to Althorp was being filmed for a proposed Netflix tell-all documentary in 2027 for the 30th anniversary of Diana's death. However, according to a royal expert, William would not be happy about it.

"Not only is Prince William likely to be livid regarding such commercialization of Althorp in such a tacky, tasteless media post, but it’ll also fuel his disgust, so he shall thwart any major reentry (by Harry into the royal family),” palace expert Hilary Fordwich pointed out.