'Star Wars' Co-Stars, Other Celebs React to Carrie Fisher's Hospitalization

From Harrison Ford to Mark Hamill, stars took to Twitter.

"We just need to tell everybody to keep the prayers up because the doctors are doing everything they can for her right now," the 60-year-old actress' brother, Todd Fisher, told ABC News. "She's a real survivor and always has been and I would expect the best from this. That's how we’re approaching it."

Harrison Ford, who played Han Solo opposite Fisher in "Star Wars," said in a statement obtained by ABC News: "I'm shocked and saddened to hear the news about my dear friend. Our thoughts are with Carrie, her family and friends."

ABC News' Lesley Messer contributed to this report.