UPDATE 7.50am

Carrie Fisher is “stable”, according to her mother Debbie Reynolds, after the Star Wars star suffered a reportedly “massive heart attack” at the weekend.

“Carrie is in stable condition,” said Reynolds via Twitter.

“If there is a change, we will share it. For all her fans & friends. I thank you for your prayers & good wishes.”

Carrie is in stable condition.If there is a change,we will share it. For all her fans & friends. I thank you for your prayers & good wishes. pic.twitter.com/isXJqqFEB6

— Debbie Reynolds (@DebbieReynolds1) December 25, 2016

Fisher spent the weekend in hospital after reportedly suffering a “massive heart attack” on a flight from London to Los Angeles on Saturday (AEDT).

Fisher, 60, was 15 minutes from landing in LAX when she went into cardiac arrest.

Some of Fisher’s fellow passengers on the United Airlines flight administered CPR.

She was reportedly “unresponsive” when the plane landed just after midday Los Angeles time and she was rushed to a local hospital.

The actress was returning to the US from London, where she had been filming the third season of British television comedy Catastrophe.

According to NBC, a law enforcement official described her condition as “not good”.

The actress’ brother, Todd Fisher, disputed earlier reports he said his sister’s condition had stabilised, telling US media she was “still in the ICU”.

Family members told US media she remained in intensive care on Friday local time (Saturday AEDT), but new details on her condition were not immediately available on Saturday. A spokeswoman at the Ronald Reagan UCLA Medical Center declined to comment, citing patient confidentiality laws.

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Family members told the media she remained in intensive care on Friday local time (Saturday AEDT), but new details on her condition were not immediately available on Saturday. A spokeswoman at the Ronald Reagan UCLA Medical Center declined to comment, citing patient confidentiality laws.

Carrie Fisher was returning home after filming for a British comedy series.

Fisher is best known for her role as Princess Leia in the beloved Star Wars franchise, where she starred alongside Harrison Ford in the original 1977 film A New Hope and its sequels – most recently 2016’s The Force Awakens.

Ford was one of several colleagues to publicly wish Fisher well following the incident.

“I’m shocked and saddened to hear the news about my dear friend,” Ford told The Hollywood Reporter on Saturday morning.

“Our thoughts are with Carrie, her family and friends.”

Fisher had been promoting her memoir The Princess Diarist, in which she revealed she had an affair with Ford during filming for 1977’s A New Hope, when she was just 19 and Ford was 33 – and married.

Actor William Shatner, best known for his role in the television series Star Trek, posted an old photograph on Twitter of him and Fisher embracing, writing that she was “all I want for Christmas.”

Other celebrities, including Ellen DeGeneres and Christina Applegate, took to social media to share their sadness, while the singer and actress Bette Midler described Fisher as “hilarious on paper and in person, and just plain beloved.”

Please send love and positive thoughts to my friend, @carrieffisher

— Ellen DeGeneres (@EllenDeGeneres) December 24, 2016

Fisher’s career was dogged by substance abuse and mental health issues.

She underwent treatment in the mid-1980s for cocaine addiction and later wrote the bestselling novel “Postcards From the Edge” based on her experience. The book was adapted into a 1990 movie starring Meryl Streep.

Fisher has also said she was briefly hospitalised in 2013 due to bipolar disorder.

Fisher has one child, a daughter named Billie, 24, with talent agent Bryan Lourd.

– with AAP