UPDATE 12/23: Carrie's brother, Todd told AP she's in stable condition.
Actress Carrie Fisher suffered a massive heart attack Friday on an airplane, according to TMZ.
Sources say Fisher was on a flight from London to LAX when she went into cardiac arrest. People on board were administering CPR.
The plane landed just after noon in L.A. and paramedics rushed her to a nearby hospital.
Fisher, who became famous, for playing Princess Leia in "Star Wars," has been on a book tour.