From a leaked call sheet  Little Swiftectives got on it: ST = Taylor Swift AJ = Jessica Alba KK = Karlie Kloss AL = Lily Aldridge HM = Martha Hunt PE = Ellen Pompeo HM = Mariska Hargitay SG = Gwen Stefani  SH = Hailee Steinfeld DL = Lena Dunham LK = Kendrick Lamar WH = Hayley Williams ZZ = Zendaya DC = Cara Delevigne GE = Ellie Goulding HG = Gigi Hadid MS = Serayah McNeil GS = Selena Gomez Some people are saying SG could be Gaga, but I fail to see the logic in that since the initials are la