A guest at President Trump’s Mar-a-Lago manse claims he gave Secret Service agents the slip to snap a selfie in Trump’s private study — but the president’s security detail insists there was no breach.

“Snuck by secret service to catch this selfie. They might have told us not to go in there,” Joseph Young posted on Instagram on Saturday night, along with a photo of himself alone in the poshly appointed room with a painting of a youthful Trump behind him.

But officials say Young didn’t sneak past anyone.

“Those reports are all false,” Secret Service spokeswoman Catherine Milhoan told The Post on Sunday. “No one got past the Secret Service.”

A Secret Service source added to the Web site TMZ that guests were allowed in the study.

Another guest even posted a photo of himself and his mom in front of the Trump portrait, too.

Young eventually deleted his post, but not before it was widely shared on social media, eliciting criticism for the president’s personal guard.

“If a goober like this can sneak in, I think it’s safe to say Russia & China have full audio/video access 24/7,” tweeted @BrianBruce7 in response to the post.

“The freaky part, “snuck by secret service” …. fined tuned machine?” @gowans_k tweeted.

But not everyone was so quick to pile on the Secret Service, which has recently come under fire for apparent lapses.

“The Secret Service is having a tough week, but if they’re only able to muster 98% effort, that’s really respectable,” tweeted @KarenDZachary.

Two agents “freaked out” Trump’s 8-year-old grandson Donald III on Thursday by taking selfies with him while he slept in a car as they drove him from Manhattan to Westchester, sparking an investigation.

The following day, someone stole a laptop containing sensitive information — including floor plans to Trump Tower — from a Secret Service agent’s motorcycle outside her Brooklyn home.

And a second surreptitious selfie was snapped in the private room on Saturday evening.

“In Trump’s study with Mom,” Frank Vigilante wrote along with a photo of the pair in front of the same painting Young posed with.

Trump was at the Florida resort, which has come to be called the Winter White House because Trump has spent seven straight weekends there since taking office in January.