Country singer Kathy Mattea was surprised on stage during her performance with flowers and an official invitation to become a ...

Fellow Sesame Street character Abby Cadabby also made her debut, performing with Loretta Lynn's granddaughter Tayla Lynn.

Elmo helped ring in the Grand Ole Opry's 100th anniversary this year by co-hosting with his “Sesame Street” pal Abby Cadabby.