Kelly Clarkson has many friends in Nashville.  And to prove it, she tells Entertainment Tonight backstage at last night's ACM Awards that Blake Shelton will be singing at her December wedding.

Kelly is engaged to Balke Shelton’s manager Brandon Blackstock.  In fact Blackstock is Reba McEntire's stepson, a romance that has completely enthrawed Kelly.

It's been rumored that the pair will spare no expense.  The wedding invite list will no doubt be a who's who of celebrities, as everyone loves Kelly... and the Blackstocks.