Exclusive! Backstage at the ACM Awards

See your favorite country stars (Kellie! Carrie!) smile for the PEOPLE camera at the 43rd annual Academy of Country Music Awards

KELLIE PICKLER

She may have lost out to pal Taylor Swift, but Pickler can't stop grinning backstage at the MGM Grand in Las Vegas. The perky singer, who performed her single "Don't You Know You're Beautiful" during the ceremony, raved about her close relationship with Swift. "We're actually engaged," she joked.