updated 04/16/2013 AT 6:00 PM ET
•originally published 04/17/2013 AT 8:00 AM ET
When it comes to diets, country superstar Trisha Yearwood has been there, done that.
“I don’t think you can name one diet I haven’t done. I’m that girl who buys every magazine where somebody’s lost 30 lbs.,” the Grammy-winning singer tells PEOPLE in this week’s cover story.
“I guess a part of me didn’t want to hear that it’s just really hard work!”
Lately, however, her hard work has paid off. Yearwood, 48, is now showing off her brand new body after dropping 30 lbs. in the past four months.
“I designed my own plan that’s low-fat, low-sugar 90 percent of the time,” says the country star.
The other 10 percent of the time, she indulges in her favorite foods – but in moderation and with the motivation to work it off the next day.
“There’s no way you never fall off the wagon,” says the best-selling cookbook author, whose go-to workout is taking Zumba classes at least three times a week. “I fell in love with it!”