EXCLUSIVE: Oprah Winfrey Happily Makes Big Weight Loss Reveal

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

For the first time, Oprah Winfrey appeared on the cover of O, The Oprah Magazine with 9 other ladies who share her desire to slim down, and she shared a weight loss reveal with ET's Nancy O'Dell earlier this week.

"My pants [are] too big!" Oprah cried, showing O'Dell the space in her waistband. "I need to buy some new pants, but I don't want to spend the money. I want to drop another five [pounds]."

PICS: Biggest Celebrity Weight Loss Transformations!

Oprah's enthusiasm for her own weight loss almost matched the excitement of the women appearing on her newest cover when they found out that Oprah was joining them for the photo shoot.

"When she got there, it was a party," SiriusXM host Jenny Hutt, who is featured on the O Magazine cover, told ET. "Music was blaring. Adele was playing in the background. Oprah was singing along out loud. All of us were dancing.

O, The Oprah Magazine

Jenny and Oprah were joined by eight other women: Michelle, Jen, Princess, Bobbi, Shaniqua, Sabrina, Cookie and Lindsay.

WATCH: Oprah Just Dropped $28 Million on a New Home

O, The Oprah Magazine

"It was my idea to share the cover with other women who are on the same journey as I am," Oprah said in a behind-the-scenes clip. "[Women] who want to lose weight and who want to make health their priority."

The magazine's April issue features women from ages 15 to 49 joining forces to get fit together. Jenny, who has struggled with weight her whole life, said Oprah is an inspiration.

O, The Oprah Magazine

"She's doing it with us," Jenny told ET. "We all had to wear unitards. Oprah put on a unitard too. She was incredibly gracious, incredibly generous, funny and warm. I'll never forget it."

WATCH: Oprah Winfrey Explains Iconic 'You Get a Car!' Moment

The April issue of O, The Oprah Magazine hits newsstands March 15.