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Donald Trump Jr. may like to think he’s moved on from his failed marriage to Vanessa Trump by finding hot new love with former Fox News host Kimberly Guilfoyle and by becoming one of his father’s most outspoken loyalists on the MAGA campaign trail.

But Omarosa Manigault Newman’s new book, “Unhinged: An Insider’s Account of the Trump White House,” released this week, could make it difficult for Trump Jr. to change the narrative about himself anytime soon.

In it, the former White House aide alleges that the 40-year-old Trump Jr. significantly contributed to his marital troubles by his desperate need to please President Donald Trump and by initiating an affair with Aubrey O’Day, a contestant on his father’s “Celebrity Apprentice” reality TV show.

Manigault Newman wrote she first heard Trump talk to his son about the importance of having something on the side in 2008, according to sections of the memoir viewed by the Daily Mail. She said Trump was with supermodel Carol Alt, then a contestant on “Celebrity Apprentice,” and Trump began reminiscing to his son about his past fling with her.

“Donald said something like, ‘Yeah, those were the good old days,'” Manigault Newman wrote. “He turned to Don Jr. and said, ‘You’ve got to get (expletive) like that. You got to get some (expletive) like that.’ Carol just sat there, Ivanka-like, and took it.”

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Manigault Newman said she remembered being disgusted, thinking, “Donald, what are you talking about? Your son is married. His wife is pregnant.”

But Trump Jr., in what has been reported to be a lifelong bid to win Donald Trump’s love and approval, followed his father’s “example” three years later by starting an affair with pop singer O’Day, who was a contestant on what would have been “Celebrity Apprentice’s” fifth season, according to Manigault Newman.

Manigault Newsman wrote that she and the Danity Kane singer had previously known each other in Los Angeles, so O’Day called her to ask for advice before she went on the show in 2011.

O’Day contacted Manigault Newman again after she started seeing Trump Jr., who was “an advisor” on the show. Manigault Newman wrote that O’Day told her, “He’s leaving his wife. They basically aren’t together anymore. They’re separated.'”

Manigault Newman didn’t believe that Trump Jr. would leave his wife for O’Day. At the time of the alleged affair, Don Jr. had been married to Vanessa Trump for six years, and she had just given birth to their third child. Pretty soon, she would soon be pregnant with baby No. 4.

Manigault Newman said she later met up with O’Day at a diner in Los Angeles. That’s when, Manigault Newman wrote, O’Day showed her “very personal photos that Trump Jr. had sent to her, a long chain of dirty texts between them.”

“If she hadn’t shown me those photos and texts, I wouldn’t have believed it,” Manigault Newman wrote.

Trump Jr.’s alleged affair with O’Day was first reported in March, days after Vanessa Trump filed for divorce after 12 years of marriage and five children. Us Weekly and other outlets reported that O’Day and Trump Jr. got to know each other in late 2011 during taping of “Celebrity Apprentice.” Several outlets said the alleged affair continued into the early months of 2012.

Manigault Newman’s version of the alleged affair is consistent with what has been reported by various outlets — that Trump Jr. reportedly wooed O’Day by claiming that his marriage to Vanessa was “on the outs.”

“He called (O’Day) all the time and really cared about her. He was giving her a lot of advice on her career,” a source told Us Weekly back in March.

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O’Day genuinely was in love with Trump Jr., Page Six added.

The alleged affair ended after Vanessa Trump found emails between the two, leading him to call it quits with O’Day. Page Six, quoting a source, said that a hurt and angry Vanessa “was going to leave (Trump Jr.) then. That was the start of the downfall.”

Donald Trump reportedly wasn’t pleased to hear about any affair and urged his son to end it — even though Manigault Newman claims the then-reality TV mogul encouraged his son to consider adultery in the first place.

“Don Jr. would tell (O’Day) how his father thought it was a bad look to leave his wife for another woman,” a source told Us Weekly in March. “In the end, he listened to his father.”

In this way, Trump Jr. once again disappointed his father, after having to constantly “submit to his father’s hazing” on the show, Manigault Newman wrote, according to the Daily Mail.

“If Donald didn’t like Don Jr.’s assessment in the boardroom, he’d berate him in front of everyone using words like ‘wrong’ and ‘stupid,'” she wrote in her book. “Don Jr. was clearly terrified of his father.”

But again, Manigault Newman’s assessment of Trump Jr.’s fear and deference to his father and of their dysfunctional relationship also is consistent with numerous other reports.

This picture of Trump Jr. starts with his own mother Ivana Trump who revealed that her husband was reluctant to name his firstborn son after himself. “You can’t do that!” Ivana Trump quoted her husband as saying in her memoir, “Raising Trump.” The future president fumed, “What if he’s a loser?”

A profile of Trump Jr. in GQ portrays him as almost a tragic figure, with writer Julia Ioffe explaining: “It’s hard being Don. Struggling to make a mark. Living as the junior to Trump senior. … Growing into a man who desperately wants his father’s love and pride yet is always mindful of the distance between them.”

The GQ profile also helps explain Trump Jr.’s transformation from a relatively apolitical vice president in his father’s real estate company — and supporting player in his father’s reality TV universe — into a “prominent MAGA troll.” Trump Jr.’s fierce advocacy of his father, and his belligerent pro-MAGA tweets, reportedly contributed to his divorce from Vanessa.

But his fervor has definitely fired up the admiration of his new girlfriend, Kimberly Guilfoyle, the ex-wife of former San Francisco Mayor Gavin Newsom. In an interview with the Breitbart News Daily podcast, Guilfoyle, 49, said she sees Trump Jr. as “the No. 1 up-and-coming political figure on the right.”

“(Donald Trump Jr.) has a compelling political voice,” said Guilfoyle who has recently hit the campaign trail with Trump Jr. for Trump-approved candidates and policies. “He’s incredibly bright.”

President Trump also looked like he was practically beaming in photos of Trump Jr. presenting Guilfoyle, a longtime Trump family friend, as his new girlfriend during a visit to the Oval Office for the White House’s July 4th celebrations.

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But writer Ioffe offered a different take on Trump Jr.’s political enthusiasm, which mostly dates back to when his father launched his run for president.

“The snarling political persona … is a show for an audience of one,” Ioffe wrote.

In any case, Trump Jr. may continue to struggle for his father’s approval, according to Manigault Newman’s book. The Daily News reported that Manigault Newman also wrote how the president offered this scalding assessment of his firstborn after learning he had released emails to the public about his controversial June 2016 Trump Tower meeting with a Kremlin-connected lawyer.

“He is such an (expletive),” Trump said about his son. “He screwed up again, but this time, he’s screwing us all, big-time!”