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Hunter Biden began dating his brother’s widow while recovering from a week spent buying crack from a homeless encampment in Los Angeles, according to a new report.

In a candid New Yorker interview with Democratic presidential front-runner Joe Biden’s troubled son, the 49-year-old lawyer explained the origins of his affair with brother Beau’s widow, Hallie, and the rock-bottom drug binge that came beforehand.

Hunter — who had already moved out of his marital home with estranged wife Kathleen over his failure to stay sober — says he became close with Hallie after a 2016 trip with her to the Hamptons and began spending most nights at her house while “sharing a very specific grief” over Beau’s 2015 death.

He made plans to head to a detox center in Arizona, but got sidetracked during a stopover in Los Angeles, where he soon asked a vagrant where he could buy crack, according to the mag.

Hunter was taken to a downtown LA homeless encampment, where someone pulled a gun on him — but he nevertheless returned several more times that week to buy drugs.

He then got into a fight outside a Hollywood Boulevard nightclub, and a man nicknamed “Baby Down” took pity on him and deposited him at a Hertz car rental office.

Hunter took his rental car to Arizona, where Hertz workers called the cops after finding a crack pipe and a baggie containing a “white powdery substance,” along with a Secret Service business card, Hunter’s driver’s license and a badge from Beau’s time as Delaware attorney general inside.

Local prosecutors declined to pursue the case, citing a lack of evidence that he actually used the pipe, according to the New Yorker.

Hunter, meanwhile, finally spent a week at Grace Grove Lifestyle Center — a local “detox, rejuvenation and healing retreat” — before checking into a resort spa, where Hallie flew to meet him and they decided to become a couple.

They tried to keep it a secret, but Joe Biden found out when Page Six called him for comment on a story revealing the relationship.

They split up later that year.

“All we got was s–t from everybody, all the time,” Hunter told the New Yorker. “It was really hard. And I realized that I’m not helping anybody by sticking around.”

Hunter spoke to the New Yorker amid his former vice president dad’s campaign for the Democratic nomination for president, to prevent “a trickle of disclosures” winding up in the press, the article says.

But he recently found himself in the headlines anyway when he married a South African woman named Melissa Cohen a week after they met — and was sued by another woman who claims he’s the father of her new son. He denies having sex with that woman.