Kelly Clarkson recently got engaged, and now she's opening up about her fiancé, Brandon Blackstock, and how being in love is the best diet.
In an interview with Cosmopolitan, Clarkson discusses her recent weight loss and how it's been highlighted in the media. "One magazine said I lost 40 pounds -- that's a small child, by the way. I lost 18 pounds," she says. "And I think that happens when you fall in love or date someone. If I'm going to be kissing or messing around, I gotta look good. There's not a fad diet."

The 'American Idol' alum adds that she worked with a trainer, who suggested she reduce her portions by half. "I just cut back my portions, I stopped eating late at night, and I work out a little more than I used to, and I literally dropped 18 pounds in a month," she explains. "I think it happens when you get really busy as well. But when I'm on my off-time -- girl, those 18 might come back."

In the February issue of the magazine, which arrives on newsstands on Tuesday (Jan. 8), Clarkson also takes the opportunity to gush about her husband-to-be, saying that she's "never been truly loved like I am right now." She adds, "Brandon’s totally the one. I’ve never been so happy."

Watch the Kelly Clarkson 'Catch My Breath' Video