Carrie Underwood is the reigning ACM Entertainer of the Year for the second year in a row. So what does she do for an encore? How about extending her Play On tour, with the addition of 50 stops, taking the trek all the way through Dec. 19 in Calgary, Alberta!

After the current leg of her tour wraps on June 20 in Saskatoon, Saskatchewan, Carrie makes four festival appearances in July and August. She then returns to the road for the extended fall leg of the tour on Sept. 25 in Portland, Ore.

Billy Currington joins Carrie on the fall leg of her tour. And once again she's taking along 'The Next Great American Band' winners, Sons of Sylvia (formerly known as The Clark Brothers) to open the show.

"Man, we love that girl," Sons of Sylvia's lead singer Ashley Clark tweeted after hearing the news. "See you on the road. It's gonna rock!"

Carrie also visits 'American Idol' on Wednesday (April 21) to perform 'Change,' from the 'Play On' album.

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