Palace insiders are appalled by Prince Harry and Meghan Markle’s grinning appearance at Kris Jenner’s 70th birthday bash — and say it shows just why the couple should not be accepted back in the royal fold.

“It’s so tacky,” said one palace insider who works with the royal family.

The Duke and Duchess of Sussex dressed up in black tie and joined a bevy of Hollywood stars at Jenner’s party, thrown by Amazon billionaire Jeff Bezos and wife Lauren Sánchez at their $165 million Beverly Hills estate Saturday night.

They were joined by celebs including Beyoncé and Jay Z, Martha Stewart, Mariah Carey, Oprah Winfrey, Paris Hilton, Adele, all the Kardashians — and Jenner’s plastic surgeon, Dr Steven Levine, who is responsible for her astonishing facelift.

“It truly shows that Harry is so far removed from the rest of the family. These people may be stars in America, but the pure ostentatiousness is at odds with what Prince William is trying to do with his life and the monarchy,” the insider said.

Also on Jenner’s guest list: Meta CEO Mark Zuckerberg, with whom Harry, 41, and Markle, 44, have a contentious relationship.

Back in January, they slammed the billionaire for “contributing to a global mental health crisis” after Meta scrapped fact-checking and restrictions on free speech.

A week after the tycoon announced Facebook would be returning to its original focus on free speech, the couple released a statement on their Archewell Foundation website — saying the move would allow “more abuse” and normalize “hate speech on my agenda,” he  said on the Apple TV+ show “The Reluctant Traveller.”

Their appearance also shows just how entrenched the Sussexes are within Hollywood, as Bezos’s company is making Markle’s upcoming movie, “Close Personal Friends.”

She will play herself in the romantic comedy and landed the cameo as she has a “connection” with the filmmakers, sources said.

The movie is being made by Amazon MGM, which is owned by Bezos, and produced by Isaac Aptaker and Elizabeth Berger.

Markle filmed her cameo last week, but we are told it doesn’t mean the former “Suits” star is making a real return to acting.

“That’s overstating things,” said an industry source.

Despite the couple having gone Hollywood, the insider admitted that some palace officials think Harry and Markle should be brought back to the royal family to help when Harry’s estranged brother, Prince William, eventually takes the throne.

However, the insider said, “William has made it clear that he has a plan for being king, and he has true class. I think he will look at the younger royals to help, including Prince Edward’s children.”

Just last month, William — who hasn’t spoken to Harry in two years — told “Schitt’s Creek” star Eugene Levy about his plans for his own monarchy..

“I think it’s safe to say that change is on my agenda,” he said on Levy’s Apple TV show “The Reluctant Traveller.”