The trio came together to cut a new track on Clarkson's upcoming album and it was clear the Since U Been Gone singer was pumped up by the chance to work with two of her idols.
She posted a photo of the studio soundboard with her name next to "Reba" and "Trisha" on Twitter.com and wrote, "So... This happened today. Suck it world! I win!"
Clarkson is about to get a whole lot closer to MCEntire - she's engaged to marry her stepson, Brandon Blackstock.