I mean, here's the deal. They're nearly best friends in life so, why not? And she may be one of the only people that could deal with the overly-sarcastic, through-the-roof drinking.

Not to mention Kelly's soon-to-be-husband, Brandon Blackstock is Shelton's manager so, she probably knows Blake inside and out and behind the scenes.  Blake and Kelly are near the same age,she's turning 32 and he's 37.

According to this picture: them seem to get along JUST fine.