Country hunk Blake Shelton will be doing more than just performing at pal Kelly Clarkson's upcoming wedding - he'll officiate the nuptials.

The Since U Been Gone hitmaker will wed Shelton's manager Brandon Blackstock later this year (13), and Clarkson has revealed the Honey Bee singer will have very special duties.

She tells U.S. news show Entertainment Tonight, "Not only is he singing, he is marrying us... He has done it before with people, he is actually marrying Ashley Monroe from the Pistol Annies as well."

The Pistol Annies is the band fronted by Shelton's wife Miranda Lambert.