Slime green, that is.
The "Dark Horse" singer debuted her new 'do on Monday (April 7), just in time for spring. It's not completely green -- her roots and bangs are still her signature black -- but it's definitely a big change-up for the singer.
Perry has famously sported a bevy of bold hairdos, but what is it about these bright colors that Katy loves so much?
"Of course, being Katy, she is a lot more edgy and she's cooler and she likes to take a lot of risks. And I love that she's like, 'I'm feeling a little blue, let's go blue' -- not in her energy, just in her hair color," Perry's longtime hair colorist Rita Hazan told MTV News back in 2012, right after the singer debuted her bright-blue locks. "She's kind of this candy-coated sort of person. It's nice to see her experiment with different things."