Blake Shelton Mentee Cassadee Pope Gives Gwen Stefani Stamp of Approval, Calls Her 'Voice' Return 'the Coolest

Blake Shelton's girls approve of his new girlfriend!

Cassadee Pope, who won season three of The Voice while mentored by Shelton, returns to the show on Tuesday night to perform her new single, "I Am Invincible."

"That is the coolest thing, because that's where I come from, that's why I'm here," Pope gushed in an interview with Entertainment Tonight at the CMT Artists of the Year event last week. "The fact that they invited me back to play my single means a lot."

WATCH: 'The Voice' alum RaeLynn Reveals Blake Shelton and Miranda Lambert's Marriage Advice 

The show also marks the first time that Pope will come face-to-face with her mentor's new girlfriend, Gwen Stefani.

"I think it's amazing," she said of the relationship. "I haven't even met Gwen, so I hope to meet her when I go to The Voice, but as long as Blake's happy."

Fellow Team Blake alumna RaeLynn, who competed on season two of The Voice, was also on-hand for last week's Nashville celebration, in which Shelton was honored alongside Luke Bryan, Florida Georgia Line, Little Big Town, Sam Hunt and more. RaeLynn and Pope joined forces with Darius Rucker for a powerhouse performance of Shelton's hit, "Neon Light."

FLASHBACK: Cassadee Pope's 2012 'The Voice' Victory 

"It means a lot to not really repay [Shelton], because I don't think I'll ever be able to do that," Pope said, "but just tip the hat to him a little bit."

RaeLynn also dished to ET about "Shefani," as they've been dubbed by the shippers, busting into an impromptu version of Stefani's 2005 hit, "Hollaback Girl."

"It's gonna be super hard not to start singing one of her songs," RaeLynn said with a laugh. "She's amazing, I think she's awesome... They're both great people."

For more from RaeLynn's interview, including details on her upcoming wedding, watch the video below.