Surprising tweet leaves Blake Shelton speechless

Blake Shelton likes to shock fans with his tweets. But Tuesday night in Nashville, the country music star received an unexpected Twitter message of his own that left him struggling for words: "Blake Shelton, you are invited to join the Grand Ole Opry!"

Shelton and his pal Trace Adkins had just performed their smash duet, "Hillbilly Bone," during "Country Comes Home" - a concert to celebrate the Opry's re-opening after flooding damaged the landmark venue this past spring.

As the crowd cheered and rose to its feet, Adkins put his arm around Shelton's shoulders and said, "He's famous for doing the Twitter thing, you know he's always sending tweets. Well, the Grand Ole Opry sent Blake a tweet tonight. Here, look!" He then handed Shelton an iPhone with the Opry's cherished invitation to become a member. Shelton grinned broadly and put his hand over his heart, while his fiancee, Miranda Lambert, applauded from the audience.

Adkins was inducted into the Opry in 2003. Brad Paisley received his invitation in 2001, and Carrie Underwood in 2008 (at 25, she became the organization's youngest member ever). They joined a roster of such legendary country music icons as Johnny Cash, Dolly Parton and Willie Nelson.

Shortly after the surprise invitation, Shelton sent CNN a message saying, "I have no words for how I feel tonight. Not only was I a part of history as part of 'Country Comes Home,' but to be invited to be its newest member - it is everything I ever dreamed of and more. September 28 will forever be, hands-down, one of the best days of my life."

Shelton will be officially inducted into the Grand Ole Opry on October 23.