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“Star Wars” actress Carrie Fisher suffered a massive heart attack on a plane Friday and was put on a ventilator, reports said.

The star, 60, who famously plays Princess Leia in the sci-fi saga, was flying from London to Los Angeles to promote her new book when she suddenly went into cardiac arrest just 15 minutes before the flight was scheduled to land at noon PST, sources told TMZ.

A frantic flight attendant asked if there were any medical personnel on board, and an EMT who happened to be sitting in the back of the plane and rushed up to first class to administer CPR.

When the plane landed, paramedics were waiting on the tarmac to rush Fisher to UCLA Medical Center.

The actress was unresponsive at the time, and an EMS crew had to work on her for 15 minutes before they got a pulse, TMZ said.

At one point, a source told NBC News that things were “not good.”

Fisher was put on a ventilator, TMZ said.

But her brother, Todd Fisher, told the Associated Press on Friday evening that his sister was “out of emergency’’ and now in stable condition.

The siblings’ parents are Debbie Reynolds and Eddie Fisher.

Fisher’s only child, daughter Billie Lourd, rushed to the hospital to be with her mom, TMZ said. Lourd, whose father is talent agent Bryan Lourd, was carrying Fisher’s French bulldog, Gary, who was on the plane with the actress when she was stricken, the website said.

“Star Wars’’ co-star Mark Hamill tweeted, “as if 2016 couldn’t get any worse… sending all our love to @carrieffisher.”

Fisher is most famous for her iconic, elaborately coiffed role as Leia — but made headlines most recently for revealing she had an off-screen affair with her “Star Wars’’ co-star Harrison Ford.

The actress also is known for her 1987 semi-autobiographical novel, “Postcards from the Edge,’’ which was turned into a movie.

She had been traveling Friday to promote her latest book, “The Princess Diarist,” an autobiography in which the blunt-spoken star revealed her affair with Ford.

Over the years, Fisher has been courageously frank about her diagnosis of bipolar disorder and her addictions to cocaine and prescription medications.