Sugarland are the latest addition to the 2011 CMA Music Fest all-star lineup taking place Thursday, June 9 through Sunday, June 12 in Nashville. The duo, who just picked up the ACM Duo of the Year award, is scheduled to perform during the concert at LP Field on Friday, June 10.

Other additions to the expanding lineup include a special guest appearance from Kelly Clarkson, who will join Jason Aldean during his set on Thursday, June 9, for a performance of their multi-week No. 1 single 'Don't You Wanna Stay.'

Also on Thursday, June 9, Alan Jackson will join the Zac Brown Band for a performance of their recent hit 'As She's Walking Away.'

The new acts join previously announced artists, including Easton Corbin, Sara Evans, Brad Paisley, Sheryl Crow, Lady Antebellum, Martina McBride, Ashton Shepherd, Keith Urban, Trace Adkins, Little Big Town, Rascal Flatts, Reba McEntire, Josh Turner, Chris Young, the Band Perry, the JaneDear girls, Miranda Lambert, Darius Rucker and Blake Shelton.

More artists will be announced in the coming weeks. For more information on the 2011 CMA Music Fest or to purchase tickets, visit the official website here or call 1-800-CMA-FEST. Ticket prices range from $115-$325, plus handling fees, for four-day passes. Single night tickets to the individual Nightly Concerts are also available for $35, plus handling fees.