Sunday night was a night for collaborations and Rascal Flatts wanted a piece of that action! They joined Christina Aguilera for a snippet of her song "Shotgun" and they transitioned into their latest "Riot".

Christina Aguilera is becoming a new face for country fans since joining the cast of ABC's "Nashville" last week as a fictional pop star who is after a career in country music. She has been at the top of Rascal Flatts' wish list for collaborators for many years, but they'd never had the chance to work together, until now. There was also a bit of redemption after last year's performance (they took a lot of heat for lip syncing due to an illness) and it was made even sweeter because of the chance they took singing with someone they'd never performed with before.

Rascal Flatts was nominated for vocal group of the year, their first nomination since 2012. They had missed being nominated, saying that they hadn't gone anywhere, but it was nice getting the calls and emails from friends and people pulling for them.