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Gwen Stefani has performed with both Blake Shelton and Adam Levine in separate works. Shelton and Stefani wrote the song "Go Ahead and Break My Heart" and performed it together on The Voice. And, at the 57th Grammy Awards, Levine and Stefani performed their song "My Heart Is Open." In the past, Stefani has also collaborated with former Voice coach Pharrell Williams as well. (Instagram)