Faith Hill, Toby Keith, Martina McBride and Big & Rich with special guest John Legend join the performance line-up for the 42nd Annual Academy of Country Music Awards, which will be held May 15 in Las Vegas at the MGM Grand Garden Arena

Shania Twain will also participate in the show in an undisclosed role. Gary Dourdan ("CSI"), Sara Evans, Heartland, Brad Mates of Emerson Drive, bull rider Justin McBride, Dr. Phil & Robin McGraw, Craig Morgan, Joe Nichols, Kellie Pickler, pro volleyball player Gabrielle Reece, actress and singer Emma Roberts, Darius Rucker, Eric Szmanda ("CSI"), actor Luke Wilson and Chris Young will present.

The sold-out show, hosted by Reba McEntire, airs at 8 p.m. ET/PT on CBS.