Miranda Lambert opened up to Us. Credit: Bryan Steffy/Getty Images

Losing 25 pounds in almost three months isn't the only way Miranda Lambert has lightened up. "The younger me was a little wilder and fast on the trigger. I'd shoot you and burn your house down," jokes the country star (wed to Blake Shelton, 37). But since turning 30 last November, "I'm a bit softer. I still might shoot you—but maybe I'll just set your garage on fire!" The CMT Music Awards nominee, who's fifth album, Platinum, is out June 3, blows Us Weekly away. 

Us Weekly: You duet with Carrie Underwood on the disc. How did it come about? 

Miranda Lambert: I sent her a rambling email asking her to do it. I figured she'd think I was crazy, but she wrote right back saying she was in. I was so nervous the day she came to the studio. We ended up having a blast. 

Us: You also sing about marriage issues. 

ML: Yep. Tabloids kept saying I was pregnant with triplets or that Blake and I were getting a $100 million divorce. We've learned to ignore the rumors and go on with our lives. 

Us: Why address your weight woes in "Gravity Is a Bitch"?

ML: My fans expect me to lay it all out! I've always been happy with myself. But when I hit 30, I thought, It's not going to get easier. So I chose to get ahead of it. There's still nothing I love more than a bag of Cheetos, though!