The beginning of the end to Donald Trump Jr.’s marriage came about years ago when he threatened to leave wife Vanessa for former Danity Kane singer Aubrey O’Day.

According to Page Six, Donald Jr. all but had his bags packed when family members, including Donald Trump Sr. himself, intervened. Senior supposedly told Junior to “knock it off.”

A hurt and angry Vanessa “was going to leave (Don Jr.) then. That was the start of the downfall,” an unnamed source told Page Six.

Last week, Vanessa Trump finally filed for divorce after more than 12 years of marriage to the president’s eldest son.

Don Jr. and O’Day, now a member of the duo Dumblonde, had an affair after she competed on season five of the “The Celebrity Apprentice” in 2011. Trump Sr. was of course the show’s host, and Jr. served as an “adviser.”

Don Jr. “pursued her. It was him who chased her,” another source told Page Six. “He told her that his marriage was already in the process of dissolving.”

That same source said Don Jr. and Vanessa, both 40, were already having difficulties before the affair. “I think his marriage to Vanessa was over long before Aubrey came along,” the source said.

The affair happened when Vanessa was pregnant with the third of the couple’s five children. Last week, a former model tweeted that Don Jr. was cyber-flirting with her shortly after Vanessa gave birth to son Tristan, who is now 6.

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Those rumors about Donald Trump Jr.’s marriage were right after all The report of their affair might bring some clarity to a cryptic tweet O’Day, 34, sent on election night 2016. Following Trump Sr.’s victory, O’Day, who had supported Democrat Hillary Rodham Clinton, declared that she was “embarassed to be an American,” according to US Weekly.

One of her followers asked why, especially since she had connections to Trump through the show. “Why are you mad that the checks stopped coming!” the follower tweeted.

O’Day responded, “No. my story I didn’t tell is worth millions now … this doesn’t hurt me, it hurts America.”