The 37-year-old actress was responding to allegations detailed in Moby’s recent memoir, "Then It Fell Apart." The singer, whose real name is Richard Melville Hall, wrote that he met Portman in his dressing room when she was 20 and he was 33.
“He said I was 20; I definitely wasn’t,” Portman told Harpers Bazaar UK. “I was a teenager. I had just turned 18. He was on tour and I was working shooting a film, so we only hung out a handful of times before I realized that this was an older man who was interested in me in a way that felt inappropriate.”
The “Porcelain” singer said he "tried to be Natalie's boyfriend" but was "relieved" when she called to tell him she had met someone else because he'd "never have to tell her how damaged I was."
"I was a bald binge drinker and Natalie Portman was a beautiful movie star. But here she was in my dressing room, flirting with me," he writes in the book, according to an excerpt in Entertainment Weekly.
But Portman said the singer’s account was filled with "factual errors and inventions.” She added it was “very disturbing” how he used this story "to sell his book."
“I was surprised to hear that he characterized the very short time that I knew him as dating because my recollection is a much older man being creepy with me when I just had graduated high school,” the “Thor” star told Harpers.
Moby later responded on Instagram to Portman's comments, doubling down on his book's account of their relationship and writing that her denial left him "confused."
"This confused me, as we did, in fact, date. And after briefly dating in 1999 we remained friends for years," he wrote.
Moby wrote that he "respects" Portman's intelligence and activism, but can't understand why she would "actively misrepresent the truth" about their relationship.
The singer concluded that while the claims in his book were "accurate" and filled with "lots of corroborating photo evidence," he understands if Portman regrets dating him.
"To be fair, I would probably regret dating me, too," Moby wrote, before adding that Portman's feelings don't change the "actual facts" of their alleged "brief romantic history."
The 53-year-old made other claims in his book, writing of an alleged fling with actress Christina Ricci and how he rubbed his genitals on then-real estate mogul Donald Trump during an encounter at a party.
Fox News' Sasha Savitsky contributed to this report.