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American Idol winner Kelly Clarkson will join Blake Shelton as a guest mentor on NBC's 'The Voice.'

Last year, Reba McEntire joined Blake to help mentor the contestants, now Kelly Clarkson will take a guest spot on the show.  If you've been keeping track, you may have noticed that Blake, Reba and Kelly have worked together a lot the past few years. The connection is no coincidence, as Reba's husband, Narvel, and Starstruck Management manages all three entertainers.

Taste of Country also reports that Kelly Clarkson recently crashed a Blake Shelton concert.  Clarkson and Miranda Lambert joined Blake Shelton on stage for Joan Jett's 'I Love Rock and Roll.'  Adam Levine, another 'Voice' judge, also joined in the fun at the Oklahoma New Years Eve concert.