Michael Jackson’s “This Is It” film isn’t out until Wednesday, but already, one of the late pop star’s best friends has branded it a masterpiece.

On Monday, Elizabeth Taylor spent around 40 minutes posting dozens of messages on her Twitter account, raving about the film, which she saw last week during a private screening on the Sony lot in Los Angeles.

The film legend called “This Is It” — a movie put together from the rehearsal footage of what would have been the July 2009 concert series of the same name — “brilliant.”

“It is the single most brilliant piece of filmmaking I have ever seen,” Taylor, who has starred in hugely lauded films, including “Cleopatra,” “Who’s Afraid Of Virginia Wolf,” “Cat On A Hot Tin Roof” and “Suddenly, Last Summer,” wrote. “It cements forever Michael’s genius in every aspect of creativity.

“To say the man is a genius is an understatement,” she continued in another post. “He cradles each note, coaxes the music to depths beyond reality.”

Taylor, who was greatly saddened by Jackson’s passing on June 25 at the age of 50 from acute Propofol intoxication, wrote that the film brought her to happy tears.

“I wept from pure joy at his God given gift. There will never, ever be the likes of him again,” she Tweeted. “And we have this piece of film to remind us forever and ever that once there was such a man. God kissed him.”

In her posts, Taylor referred to Jackson’s lyrics as “those of a modern day prophet,” and suggested people should listen to songs like “Man In The Mirror” and “take his words of responsibility seriously.”

Taylor, herself a two-time Oscar winner, suggested the film should be “nominated in every category conceivable.”

And the 77-year-old also suggested everyone should see the film.

“You owe it to yourselves and your loved ones to see this again and again. Memorize it and say to yourselves, ‘I saw genius in my lifetime,’” she wrote. “I loved genius in my lifetime. God was so good to me. I will love Michael forever and so will you, if you don’t already.”

Before wrapping up her postings, she urged people to remember Jackson and his message of “love.”

“We cannot let his life be in vain / and always done with love,” she wrote.