Hunter Biden was so strung out on crack cocaine a few years ago that he brought both his girlfriend and his brother’s widow — both of whom he was sleeping with — to President Biden’s Virginia home. There, the first son kept his drug paraphernalia “locked up” in his own wing of the house, according to the now ex-girlfriend. Lunden Roberts, whose bombshell memoir, “ Out of the Shadows: My Life Inside the Wild World of Hunter Biden ,” is out August 20, told The Post that Hallie Biden did not appear “very street smart” when the two spent time with an often-high Hunter at Joe Biden’s rented house in McLean, Va.

“You need to meet Hallie. You’ll love her. And she’ll love you.

Let’s all get together!” she writes that Hunter told her not long after they met in 2017. “Am I really spending time with someone who’s in a seemingly open relationship with his sister-in-law?” Roberts, 33, muses in the book. But hanging out with the now-president’s son and his brother’s widow is almost a footnote in Roberts’ rollicking, nearly-400-page tale of being a fly on the wall of Hunter’s chaotic life.

Contrary to what’s been reported, Roberts told The Post and writes in her book that she did not meet Hunter at a strip club — but instead at a small party at the offices of his investment firm, Rosemont Seneca, which was then located at the Swedish Embassy in Washington, DC. She was invited by a friend. At the time, Biden, who was found guilty of felony gu.