Country superstar Miranda Lambert recently revealed the secrets behind her dramatic weight loss to People magazine.

Lambert, 30, has lost a significant amount of weight compared to 2012, and attributes the weight loss to portion control and exercise. One of her main sources of nutrition have been store-bought prepared juice.

"I don't do the juicer myself because I hate to clean it. It's a mess and I'm not that disciplined!" she noted. As for other foods, Lambert added, "I haven't given up everything! I try to just cut everything in half."

She is also doing plenty of cardio, circuit training and lunges, allowing her to drop dress sizes. Lambert's husband, fellow country superstar Blake Shelton, is very happy with her new body even though he said he loved her no matter her size.

"He said, 'I have never had a problem with any way you look at any point - you are beautiful to me at any size and every size,' " Lambert said. "But he has been proud of my hard work on this. He brags on me. That makes me feel great."

Shelton joked to People, "She even said . . . 'I can't use that I'm-only-in-my-20s excuse anymore about anything. Now it's time to be responsible.'"

Miranda Lambert Weight Loss, Follows Blake Shelton Cheating Rumors

Lambert and Shelton are coming off of big wins at the Country Music Awards (CMAs) in early November. Lambert took home the award for Female Vocalist of the Year while Shelton won Male Vocalist of the Year and Album of the Year.