The singer is currently on a farewell tour following his recent announcement that he is suffering from Alzheimer's disease.
Jason Aldean
Sugarland
Brad Paisley
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"I think it would surprise you how good it would sound, me and Cee Lo together," Shelton says.
The guitarist is the country group's last bachelor, and he'll walk down the aisle with his fiancee on February 4.
Pickler admits her upbringing was tough, and she used her anguish to help her write the track "Mother's Day" for her album 100 Proof.
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Mama's Song
Zac Brown Band
Luke Bryan
Eric Church
Chris Young
The Band Perry
Kenny Chesney
David Nail
Martina McBride
Dierks Bentley
Hunter Hayes