Watch: Ryan Murphy on Lady Gaga — "Everybody in the Cast Has a Different Version of Her"

"Kathy [Bates] calls her Stefani, so everybody in the cast has a different version of her."

American Horror Story: Hotel creator Ryan Murphy and castmember Lady Gaga are kindred creative spirits (Gaga refers to Murphy as her "creative soul mate") and good friends, but what does a friend of Gaga call her?

“Sometimes I call her Gaga, sometimes I call her Lady; I also call Julia Roberts Lady, so that’s sort of a lot of ladies. I don't know how that happened. Sometimes I call her Stefani.”

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Murphy goes on to describe Gaga's relationship to each castmember on American Horror Story: Hotel, saying, "Kathy [Bates] calls her Stefani, so everybody in the cast has a different version of her, so it's interesting to see who in the cast calls her what. I love that."