Speculations are rife that Taylor Swift and Katy Perry are "straight-up enemies".
The 'Dark Horse' singer made a reference to the 'Mean Girls' film in a tweet to her 56.7 million followers, as a response to Swift's recent interview with Rolling Stone, in which she opened up about a fellow unnamed artist with whom she is "straight-up enemies", ABC News reported.
The 'Roar' hitmaker tweeted "Watch out for the Regina George in sheep's clothing", referring to Rachel McAdams character, who faced off against Lindsay Lohan in the 2004 hit comedy.
The 'Love Story' singer had earlier revealed that a fellow musician "basically tried to sabotage an entire arena tour" and also gave her the "harshest insult" of her life, which has prompted her to "avoid her".
Swift added that she is "not the female police" but added that it has "broken my heart".