The iconic "Star Wars" actress went into cardiac arrest while onboard a LA-bound flight on Friday, according to The Hollywood Reporter.
She is currently transported to UCLA Medical Center and is "out of the emergency room" but still being treated, her brother, Todd Fisher, confirmed.
As the news broke that Fisher went into cardiac arrest, many of her friends and co-actors, including Mark Hamill, Dave Prowse, William Shatner and among others tweeted their concern for her.
Prowse, who played Darth Vader in the original "Star Wars" trilogy, tweeted, "Sending love to @carrieffisher."
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"Thoughts and prayers for our friend and everyone's favorite princess right now... @carrieffisher," Chewbacca actor Peter Mayhew tweeted.
"Sending my love. Please recover @carrieffisher," wrote Lando Calrissian actor Billy Dee Williams.
While Shatner tweeted, "I ask everyone to stop for a moment and send special thoughts to @carrieffisher.