Portrait of an Artist was sold to an unknown buyer and the identity of the seller is also unconfirmed.
The Hockney painting is not the only one making news this week.
A visitor views "Portrait of an Artist (Pool with Two Figures)", a 1972-painting by David Hockney, during a press preview for the British artists' retrospective at Tate Britain in London, England, Feb. 6, 2017.
Hockney's 1972 work depicts a landscape reminiscent of the South of France containing two men including the artist's former lover Peter Schlesinger.
WikiLeaks Says Founder Julian Assange Charged In US
The filing in the Eastern District of Virginia came on August 22, in a case that combines national security and sex trafficking. Since June 2012, Assange has been living in the Ecuadorian embassy, afraid that if he steps outside he will be arrested.
Hockney's painting is now the most expensive painting ever sold at auction by a living artist. The highest price paid for an artist in a private sale belongs to Jasper Johns, whose "Flag" sold to hedge fund billionaire Steve Cohen for about $110 million in 2010. Forbes estimates the 81-year-old's fortune at $5 billion (€4.4 billion).
Hockney said he was drawn to California by the sunshine, far from his hometown of Bradford, England, which he described as having a "gothic gloom".
But, while grappling with the breakdown of their relationship, Hockney realized after months of work that he wasn't happy with the composition - the angle of the pool was all wrong.
In an interview at his Los Angeles studio two years ago, Hockney told Mason he doesn't know why it's been so popular over the years, and aptly pointed out, "If there were a formula for that, there'd be a lot more of them, wouldn't there".
It was first sold for $18,000 and has since become Hockney's most iconic oeuvre. "When I paint, I feel I'm 30".