09/15/2010 02:26 pm ET | Updated May 25, 2011

LeAnn Rimes In A Bikini: Why I Cheated On My Husband (PHOTO)

LeAnn Rimes covers the new Shape magazine in a bikini and in the interview she talks about cheating on ex-husband Dean Sheremet, exercising with new boyfriend Eddie Cibrian and how her body has changed over the years.

Here are some excerpts, read the whole thing here.

On how exercise helped her through the affair:
"Going to the gym and punching out some of my aggression on a pair of mitts has been a lifesaver. Sometimes I felt so depressed I didn't want to get out of bed, so just getting to the gym--even for a few minutes--was a big accomplishment. It really did make me feel better and kind of saved me. It gave me a bit of sanity."

On her reasons for cheating:
"My relationship with Dean was great, but ultimately it wasn't a fulfilling marriage for either of us. We got married so young: I was 19 and he was 21, so as we got older, we grew apart. I understand why people are disappointed in me, especially since I grew up as America's sweetheart. I think any relationship is hard to get out of, and I don't think the way I did it was right. I truly believe there are lessons in it for me to learn. Cultivating strength from rough situations is the most important thing. After going through this, I know I can face anything."

On her bikini body:
"I feel like my body is changing and that I'm growing up into a woman. I probably weigh about 6 pounds more than when I shot that cover, but my body fat is the lowest it's ever been. I've gained a lot of muscle, and I feel like I have more curves too. My butt--well, I've always had a butt--but now I definitely have a butt, which I love. I've taken up weight training three or four times a week, and I do a lot of squats. I've also been doing more cardio, even though I absolutely despise it. I try to get in a good 20 to 25 minutes before I do anything else; if I don't do it first, it won't happen."