King Charles, Prince William and Kate Middleton heckled by protesters

Protesters at Commonwealth Day bluntly expressed their feelings about ex-Prince Andrew to Prince William, Kate Middleton and King Charles.

In footage circulating via X, the trio arrived for service at Westminster Abbey in London on Monday, where members of anti-monarchy organization Republic confronted them with large, yellow letters spelling out, “What did you know?”

Other signs read “Not My King” and “Down with the crown” as protesters shouted “What did you know?” and “Boo,” in an apparent reference to Andrew Mountbatten-Windsor’s alleged ties to late convicted sex offender, Jeffrey Epstein.

Middleton, Prince William, King Charles, and Queen Camilla were seemingly unaffected by the chaos. Wearing their Sunday best, the trio made their way past the protesters and into the services without acknowledging them.

But a palace insider told People that the spectacle is no laughing matter.

“If it comes out that people knew stuff — whether it be members of the family or police or staffers — then heads must roll,” said “The Windsor Legacy” author Robert Jobson to the outlet, regarding the fallout surrounding Andrew’s dramatic Feb. 19 arrest.

A palace insider also told the outlet, “Other events have rocked the monarchy, but something from within — where someone is being arrested — is very different. This is much more serious.”

Reps for Kensington Palace did not immediately respond to Page Six’s request for comment on Monday.

The former Duke of York’s arrest on suspicion of alleged misconduct in office came after renewed scrutiny following the release of documents related to the Epstein case.

Though he was released that same day, Mountbatten-Windsor, 66, could face a maximum sentence of life in prison if convicted.

Documents released in February revealed an accusation that an incident occurred at Mountbatten-Windsor’s former home, Royal Lodge — which he has since vacated after an order by King Charles.

He was also stripped of his former “prince” and Duke of York titles in October as the royal family seeks to distance themselves from the scandal.

On Monday, another savage snub was delivered by the palace — Mountbatten-Windsor was left out of his younger brother Prince Edward’s official 62nd birthday tribute.

The Royal Collection Trust shared a throwback photo of the Duke of Edinburgh playing with brother King Charles and Princess Anne, but Andrew was nowhere to be seen in the snapshot.

“Happy birthday to The Duke of Edinburgh, born on this day in 1964,” they wrote in the caption. “Prince Edward plays with his big brother and sister in this photo from 1969.”

Prince William, meanwhile, was said to have urged King Charles to “banish” the former prince back in 2019.

“William was absolutely adamant after seeing that BBC ‘Newsnight’ interview with his uncle and the disastrous explanations that he gave for being friends with convicted sex offender Jeffrey Epstein,” royal author Russell Myers told Us Weekly last month.

“Refusing to apologize for his relationship and refusing to acknowledge the actual trauma of Epstein victims was an absolute red line for William.”

The author further claimed that William “actually said to the late queen and his father [King Charles III], ‘He has to be banished. Andrew has to be rid of both the public and the private royal family.’”