One of the things the Voice coach appreciates about Dion is the way her music has affected people, and the true scope of its influence across the globe.
"Her music speaks to the world and transcends all these language barriers," Stefani said in a solo interview. "It's just incredible to be around someone that's been able to touch so many people. She really is a phenomenon."
As excited as Stefani was, the members of Team Gwen were even more dumbfounded by singing in Dion's presence.
Hopeful JChosen, who joined Team Gwen after delivering a performance during the blind auditions that got all four coaches to turn their chairs, was particularly nervous to show his skills in front of Dion and Stefani together.
"The most nerve-wracking thing about this is singing in front of these legends," he admitted. "It's intimidating."
She also advised the performers to keep their eyes on the crowd, even breaking out a sultry little dance to pull their focus up. "I tried so hard to get undressed for you to look at us!" Dion joked. "But honestly, you did an amazing job."
After the show was done, the "My Heart Will Go On" singer shared her appreciation for Stefani on Twitter, writing, "I love working with you @gwenstefani! We have so much fun together!