Debbie Reynolds and Carrie Fisher

Fifty pounds lighter, Carrie Fisher isn't afraid to criticize her former self.

"I looked awful," the actress, author and Jenny Craig spokeswoman told Extra. "I'd like to say it was my health, and be like somebody who's a good role model, [but] that was a byproduct."

Did Fisher make the list? See our gallery of the most dramatic celebrity weight loss

Fisher, who jokingly referred to her larger self as a "whale," admitted she has always had insecurities about her looks. "I never was a fan of my appearance," she says. "I looked at my mother as a little kid and thought, 'Well I look like a thumb compared to that.' I better develop something else."

In addition to her new slimmer figure, Fisher opened up about her friendship with Michael Jackson. She recalls spending a "sweet" Christmas with the late pop singer, whom she called "the sweetest man."

Although Jackson's doctor at the time of his death, Dr. Conrad Murray, is still on trial on charges that he killed the singer by administering a fatal dose of medication, Fisher says she is convinced Murray killed her friend. "[Dr. Murray] put these drugs into him. [Dr. Murray] knew the dangers of it."

Fisher's latest book, Shockaholic, is out now.