An incensed Donald Trump’s Twitter rage over a provocative super PAC ad featuring a nude photo of his wife, Melania — and his subsequent threat to “spill the beans” on Ted Cruz’s missus — may turn out to only help the Teflon billionaire’s surging campaign, experts told the Herald.

“Like so many attacks on Donald Trump, it’s boomeranged,” said Thomas Whalen, a political history professor at Boston University. “A lot of women voters who are not generally sympathetic to ?Mr. Trump, they might be sympathetic now because of him defending his wife. … He’ll probably benefit politically from it.”

Until Tuesday night, the GOP rivals had mostly left each ?other’s wives out of the crude campaign vitriol that has included name-calling, accusations of pants-wetting and disagreements over the size of their “hands.”

But a furious Trump took Cruz to task for an ad on Facebook from the super PAC “Make America Awesome” featuring a posed, nude photo of Melania with the caption: “Meet Melania Trump. Your next first lady. Or you could support Ted Cruz on Tuesday.” The ad was ?targeted at Mormons in Utah, where Cruz won easily on Tuesday night.

“Lyin’ Ted Cruz just used a picture of Melania from a G.Q. shoot in his ad. Be careful, Lyin’ Ted, or I will ?spill the beans on your wife!” Trump tweeted.

Cruz disavowed the ad and the super PAC in a tweet of his own: “Pic of your wife not from us. Donald, if you try to attack Heidi, you’re more ?of a coward than I thought. #classless.”

But Trump doubled down on the allegations yesterday.

“Lyin’ Ted Cruz denied that he had anything to do with the G.Q. model photo post of Melania. That’s why we call him Lyin’ Ted!” he tweeted.

Even though no evidence has emerged connecting Cruz himself to the super PAC, Trump’s Twitter-shaming, showing no distinction between the two, could ?still win over sympathizers, said an expert.

“One of the tried and true responses to a third-party attack is to blame the candidate,” said Florida-based GOP strategist Alex Patton. “If Trump says it loud enough and often ?enough, Trump supporters will believe it.”

Trump’s critics have struggled to inflict actual damage on the billionaire, and the sleazy ad may be evidence of a last-ditch effort.

“It’s a realization that time’s running out and if they’re going to do anything they have to do it now,” said Timothy Hagle, a political science professor at the University of Iowa. “But that can backfire. A lot of times when people go after Trump, his supporters just get ?more entrenched.”

Typically, candidates’ spouses have been off-limits in modern political races, as long as they stay in the background and steer clear of crafting policy or mudslinging. But that hasn’t always been true.

“Andrew Jackson’s wife was attacked very personally when he was running against John Quincy Adams,” said ?John Baughman, a political science professor at Bates College in Maine.

“It was less personal and less nasty, but Eleanor Roosevelt, when Franklin (Roosevelt) was running for re-election, was targeted for attacks. By historical standards, it’s actually not ?that uncommon.”