Kirstie Alley lost 50 pounds. Credit: Stephen Lovekin/Getty Images; David Livingston/Getty Images

Keeping it off! Kirstie Alley started 2015 on a positive note, stopping by the Today show on Monday, Jan. 5, to debut a major weight loss.

The Kirstie actress, 63, caught up with Matt Lauer to show off her body transformation and discuss her stunning 50-pound drop. Alley previously chatted with Lauer about her health and weight this past April, when she told the journalist that she was hoping to lose 30 pounds. 

After greeting the funnywoman and telling her she looked "fantastic," Lauer asked Alley, "So, are we at 30?"

"We're at 50!" the Fat Actress star shot back, going on to reflect on her journey. "I do roller coaster… this time it's different."

A spokesperson for Jenny Craig, Alley said she shed the pounds thanks to the weight loss system.

"This time, I really accessed our consultants," she said. "I did [use them in the past] but I didn't really listen to them that much. This time I really listened… I really listened to her and we would plan things out more carefully."

In addition to utilizing her personal Jenny Craig consultant, the Golden Globe winner told Lauer, 57, that she had to change her mind-set, as well. 

"Before I've had more of a view of 'Get to the goal, have the goal,'" said Alley, who has famously lost and gained weight many times over the years. "This time I thought, 'Okay, what is the goal? What is the time-span of the goal?' I really looked at it as this is my life, and until I'm dead basically, I am going to keep this this way, instead of like, 'Oh I lost 50 pounds and now I can do whatever I want.' I don't have that anymore… my goal is to keep this and maintain this throughout my life."

The slimmed-down star went on to reflect on another personal journey, and how it relates to her weight loss. Once addicted to cocaine, Alley finally got clean after years of abuse in the 1970s. She explained to Lauer that she had to similarly change her habits to achieve and maintain weight loss.

"I'm sort of hardheaded," she said. "When I used to do drugs, it took me a while to quit, quit, quit, and then it was done. I feel like that's occurred for me."