Blake Shelton & Miranda Lambert divorce RUMORS: country music couple 'going strong' on 'The Voice,' songstress wants hubby to 'grow up' and stop drinking, frat-boy lifestyle?

Despite ongoing divorce rumors, Blake Shelton and Miranda Lambert are still going strong. In fact, the "Over You" songstress will once again join her hubby on season six of "The Voice" as a guest mentor. But is she still worried about the country crooner's crazy drinking habits?

According to "The Voice" host Carson Daily, Shelton and Lambert make a great team on AND off cameras:

"It's become incestuous. Miranda is a vocal fan of the show. She tweets about it and is very active about it, so this makes perfect sense. I'm surprised we haven't done it sooner. In fact, I wish they'd give Blake's seat to her for one season. We're thrilled to get her" (via zap2it.com).

Shelton and Lambert enjoy flirtatiously goofing off together, but does the "Boys 'Round Here" crooner need to tone things down and act his own age every once in awhile?

"Miranda told Blake that he's almost 40 years old [he turns 38 in June] and needs to stop with his all-night frat-boy lifestyle," an alleged source reveals to Star magazine. "Miranda finally declared that he needs to either grow and mature with her, or she's leaving." 

That also means that Shelton needs to stop drinking so much - especially because it's a bad influence on Lambert's weight loss.

"Losing weight has really helped Miranda grow spiritually," the source continues. "She feels like a whole new person. She's realized that she feels much better without staying up all night and drinking alcohol." 

Apparently, Shelton isn't on the same page:

Even so, the couple insists that there's nothing wrong with their marriage. They continue laughing such break-up rumors off.