Best Celebrity Halloween Costumes Peterborough, ON, Canada / 100.5 Fresh Radio Catherine Hanrahan November 02, 2015 06:31 am Here’s a roundup of some of the best Celebrity Halloween costumes. Taylor Swift was Olaf from Frozen when Endina Menzel joined her on stage. Katy Perry got the last word though, dressing as a mic drop. *Drops mic on your Halloween* 🎤⤵️ A photo posted by KATY PERRY (@katyperry) on Oct 31, 2015 at 8:21pm PDT Kim Kardashian seemed pretty thrilled with Kelly Ripa’s tribute. And Heidi Klum’s prosthetics made her Jessica Rabbit costume legendary. Check out more great celeb costumes here.