HAILEY Bieber has shared another costume as she prepares for Halloween.Hailey, 26, let everyone know she’s the “bad girl” when she dressed up as Cady Heron, Gretchen Wieners, Karen Smith and Regina George from the hit 2004 comedy “Mean Girls.”In the first Snap Posted on the supermodel’s Instagram, Hailey transformed into the characters as they were placed on the film’s poster.In the second image, the Rhode founder placed a photo of herself in the infamous Burn Book and wrote: “This girl is the nastiest bitch I have ever met. Don’t trust her, she’s an ugly bitch.”Hailey’s picture even...…HAILEY Bieber has shared another costume as she prepares for Halloween.Hailey, 26, let everyone know she’s the “bad girl” when she dressed up as Cady Heron, Gretchen Wieners, Karen Smith and Regina George from the hit 2004 comedy “Mean Girls.”In the first Snap Posted on the supermodel’s Instagram, Hailey transformed into the characters as they were placed on the film’s poster.In the second image, the Rhode founder placed a photo of herself in the infamous Burn Book and wrote: “This girl is the nastiest bitch I have ever met. Don’t trust her, she’s an ugly bitch.”Hailey’s picture even...WW…