• KATY PERRY photo | Katy Perry

Credit: Getty; Courtesy Katy Perry

Published: Wednesday October 01, 2014 06:00 AM EDT

2014

KATY PERRY

The star has taken her hair from “slime green” to a new vivid hue – and she’s reached into our collective childhoods to come up with the perfect shade: "Muppet red" (her words, not ours).