Shania Twain may be country music royalty, but somehow, she hadn’t met Blake Shelton before appearing on The Voice!

This week's musical advisor, who joined the contestants and coaches on Monday’s live show, opened up to ET’s Sophie Schillaci about meeting her fellow country star for the first time on the NBC singing competition.

“He is just really sweet and kind,” gushed Twain, who was also impressed that Shelton knew all of her songs. “He was very nurturing and caring and welcoming to me… a true gentleman.”

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The five-time GRAMMY winner was already tight with Alicia Keys and Adam Levine -- who recorded some of Maroon 5’s 2009 album, Hands All Over, at Twain’s home in Switzerland. She had even met Shelton’s girlfriend, Gwen Stefani, years ago, when she and No Doubt both performed during the Super Bowl XXXVII halftime show in 2003!

“This was pre-children for her… so it was fun reminiscing about all of that,” Twain recalled.

And the feeling is clearly mutual! Stefani even jumped into the interview to gush about her favorite Shania song -- “Still the One,” in case you were wondering -- and the “amazing time” she had working with Twain on The Voice.

“I had a amazing time going back and listening to all of the songs … and then getting to know you a little bit… It’s been Shania week for me,” Stefani raved, adding of Twain’s upcoming album, “I can’t wait for the new record because I can't wait to hear what you have to say.”

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The rest of the coaches and contestants were clearly equally welcoming, as Twain had nothing but love for her Voice experience.

“I feel so at home… everybody has made me feel at home,” she gushed. “First of all, the contestants have been so gracious. They are so grateful to have the opportunity with their own coaches... they are ready to learn, they’re open-minded and so that was like, wow, that was great. This is the way that it should be. This is a great working environment.”

The country superstar had such a great time, she said she’d “totally” consider a full-time gig on the singing competition.

“The timing was never right for me, but I don't know, this has been such a great experience I think I'm just going to move in,” she said with a laugh. “They don't know it yet.”

Twain also opened up about her new album -- her first since 2002’s Up! -- revealing that she’ll be debuting the first single at the Stagecoach Festival this weekend! See more in the video below.

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