LeAnn Rimes Malibu Party Store shopping dress

We love that smile ... and that sexy cleavage-baring maxi dress? Hotness!

Yesterday afternoon LeAnn Rimes was snapped shopping in Malibu, and after doing 12 three-minute rounds at the boxing gym, we think she's allowed to relax for a bit! "Wow, are you kidding me! I'm drenched and exhausted from that workout," she tweeted. "That's not for the faint of heart." It sounds like quite the cardio session, but LeAnn is clearly reaping the benefits from busting her butt at the gym -- her bod looks amazing!

Unfortunately, it looks like the country singer's weekend had taken a turn for the worse, as she wrote this morning, "Anybody ever have a kidney stone?! Happy Saturday to me. I'm so beyond disappointed. I'm laid up in bed, can't move :( morning to you all." Oh no! Hopefully she feels better soon!