On the new Billboard Pop Shop Podcast, Katie & Keith are chatting about Ariana Grande kicking off the 'Wicked: For Good' press tour by sitting down with Evan Ross Katz on his 'Shut Up Evan' podcast. In the 45-minute-plus conversation, Katz asks what Grande's relationship is with mentorship -- and that's when she shouts out the triumvirate of pop superstars. There's Madonna, who was "immediately very kind," Grande said. Then there's Beyoncé, who invited Ari to join her on a music video set early in her career ("she just was being kind"). Then there's Mariah Carey -- because "of course, Mariah."

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