updated 12/19/2012 AT 4:00 PM ET
•originally published 12/19/2012 AT 5:00 PM ET
Kelly Clarkson has someone she owes an extra special thank-you to this holiday season.
“I told Brandon [Blackstock], ‘Man, you need to grow up and figure out that you need to marry this girl,’” Shelton, 36, who is managed by Clarkson’s fiancé, told Hollyscoop. “You need to get your head out of your ass and ask that girl to marry you.”