"The Voice" coach and country music superstar Blake Shelton has agreed to perform at this summer's Barefoot Country Music Festival in Wildwood. The festival organizers made the announcement Friday morning. Carrie Underwood has already agreed to headline one night of the three day festival. Now Blake Shelton will headline one of the other three nights. Early bird tickets for the event sold out before the addition of Shelton was announced. Regular priced tickets are still available on the "Barefoot" website. More top performers are expected to join Underwood and Shelton in the weeks ahead. The festival will take place Friday June 19th through Sunday June 21st at Morey's Piers. Last month the mayor of Wildwood said the festival and city are ready for up to 100,000 people.