Happy 29th birthday, Katy Perry! While many celebrities opt to take it easy on their special day, the show went on for Perry, who took the Good Morning America stage this morning to give students at Lakewood High School in Colorado a high-octane performance. But long before the singer roared her way into the hearts of fans everywhere, she was a high school student herself, and was almost unrecognizable with her chin-skimming blonde bob. Her style is still ever-changing -- she shed her candy-colored hairstyles and avant-garde costumes for a more polished appearance just this year -- and Perry continues to find inspiration everywhere for her next look. "Comic books, Blade Runner, Lolita—so many inspirations come into play when I'm doing my hair and makeup," she told InStyle previously. "Every morning I think, Who am I going to be today?" To celebrate Katy's 29th birthday, we're taking a look back at her most-iconic hair and makeup choices, starting with her high school years to today. Check out her transformation in our gallery!