Maureen McCormick's Skinny New Look

Brady Bunch icon Maureen McCormick is still fighting the battle of the bulge as she promotes her new TV show and upcoming autobiography, she admitted to OK!.

She's turned to a new weight loss method that helps curb her appetite.

"I'm using this product called Slim Shot and it reduces your appetite by like 30 percent," she says. "And why I love it so much is that it tastes like rice milk, which is one of my favorite things. I always like to have rice milk on my cereal with my husband."

Maureen,51, recently put back on ten pounds but, lately, she lost half of the weight. Her reason to look fit? She's appearing on the new CMT reality show Outsiders' Inn, a sequel to her last show, Gone Country. The new program films Maureen in a country-style living experience with such stars as Carnie Wilson and Bobby Brown.

And Maureen's tell-all biography, Here's the Story, comes out October 15. Although the actress, who played America's most memorable TV teen, Marcia Brady, is tight lipped about the contents, she's sure to share her recent weight struggle with OK!, who has followed her since last year.

After doing Celebrity Fit Club in Spring of 2007, Maureen lost 38 lbs., going from 154 to 116, and her amazing weight loss was featured in an OK! cover story. But when OK! visited her again in November 2007, she had regained ten pounds.

"I'm 5'3, I'm always up and down," Maureen says. "I love to eat but I just feel best when I'm at a thin weight. I get to a place in my life sometimes where I don't excercise. I'm an all or nothing girl. I give in to something all the way or I back off and so I backed off--but now I'm back on!"

Having won the Celebrity Fit Club reality show in 2007 has helped Maureen keep off most of the weight. "That's a good thing, because I'd probably weigh 500 pounds otherwise!" she laughes. "I think it's part of everybody's life--gaining weight, losing weight,excercise--it's just one of those things."