Just as we reported last week, Rihanna shared the 2011 ACM Award stage with Sugarland's Jennifer Nettles. But, instead of performing one of Sugarland's genre-bending hits, the duo delivered a rendition of Rihanna's slower ballad, 'California King Bed' from her platinum album ‘Loud.'

Rihanna was the first to take the stage, donning a red pixie cut and a white dress with fringe -- a perfect accessory for shaking things up on stage. A longer-haired Nettles came out during the chorus, sharing vocals with the pop songstress:

"In this California king bed / We're 10 thousand miles apart / I'll be California wishing on these stars / For your heart for me / My California king"

Once they reached the bridge, the girls shared strong harmonies, especially at the end when they belted the last line: "Maybe I've been California dreaming."

There's even a nice guitar solo at the end -- fitting for Slash, despite the fact that 'California King Bed' is, well, a ballad.

Sugarland's most recent album, 'The Incredible Machine' spawned two singles, one of them the pop-laden, 'Stuck Like Glue.' This is the second pop artist to take the ACM stage: Steven Tyler joined Carrie Underwood, as they both performed 'Undo It' and his hit, 'Walk This Way.'

Watch Rihanna and Jennifer Nettles Perform 'California King Bed' at the 2011 ACM Awards