Stewart Cook / REX / Shutterstock / Rex USA 1 / 5
Stewart Cook / REX / Shutterstock / Rex USA 1 / 5

Oprah Winfrey is packing a lot fewer pounds than she was a few months ago, and she did it all with the help of a company that she is a partial owner of.

On Thursday, Oprah stepped on the red carpet at the premiere of her network OWN's new drama series, "Greenleaf," and in doing so, she showcased her 30 pound weight loss.

Last October, the media mogul purchased 10 percent of Weight Watchers and immediately began to follow the program, with an eye certainly toward shedding some weight.

Things are certainly going well for her!

The smiling Oprah looked as slim as she's been in years, dressed in a form-fitting black blouse and flowing skirt. Not only is she looking good, though, she's also feeling good after a recent doctor's visit.

"Best Health report card ever!Total cholesterol 180.. LDL 82. thanks to #wwsmartpoints #ClevelandClinic #AnnualCheckup," she captioned a photo of herself posing with her doctor.

As one of the most well-known celebrities on earth, Oprah's yo-yoing weight has been documented for years in pictures and in her own personal words.

In a phone call with Weight Watchers members in late January, she said, "Every other time I've ever gone on a diet, I've gone on a diet and then gone off the diet, because I had gotten to the weight I'd wanted to be. The difference is, I've made the shift and this is the way I'm going to live for the rest of my life."

In a call two months later, she spoke about how the system works for her and how she manages questionable dietary choices.

"I basically eat exactly what I want and if I can't figure out what the points are…I just say I'm going to pass on that," she told members in March during another call. "If I can't begin to measure the points, I usually pass."

If Oprah ever needs help, she can always turn to her BFF Gayle King, who joined the Weight Watchers program in September 2015, right around the time of Oprah's ownership grab. Gayle, to date, has lost 30 pounds.