Kristin Chenoweth has Ariana Grande's back. The Tony Award-winning actress, who originated the role of Glinda the Good Witch in the Broadway production of is setting the record straight on a big rumor about Grande's performance in the show's upcoming film adaptation. ET spoke with Chenoweth at the 5th annual Vanderpump Dog Foundation Gala in Beverly Hills on Thursday, where she responded to speculation regarding whether Grande may have been lip syncing over Chenoweth's voice in footage from the London set.«I cracked up because I have heard it and I knew it was her, and I was like, 'Why did they think that's me?'» Chenoweth told ET's Brice Sander.«We are very similar and we have been her whole life, and then when we talk on the phone we sound like dolphins,» she joked.