Katy Perry certainly heard her fans roar over her hair change.

After the American Idol judge shared a video of her getting her hair cut into a bob ‘do she confirmed it was only a wig and she hadn't actually made the chop. But for her, the bait and switch served as a reminder to fans not to make fun of her past eras. 

"Stay ready, stay pressed," Katy playfully told E! News' Will Marfuggi at the American Idol Top 8 post show April 29. "May this be a teachable moment for any of my fans who may have had something to say that may have been not kind. I'm watching."

At the end of the day, the discourse over Katy's could-be cut is nothing new. "People have really strong feelings about my hair," she added. "For years, they have." (For more exclusive Katy, tune into E! News April 30.)

Before revealing her short hair was a wig, the "Roar" singer's fans quickly compared her faux chop to her infamous 2017 pixie cut, which she debuted around the release of her album Witness.

Of course, Katy—who shares daughter Daisy Dove, 3, with fiancé Orlando Bloom—knew her April 29 wig video would trigger fans to recall the moment, as she quipped, "thoughts, comments, concerns," in its caption. And fans did not hold back. 

One commenter wrote, "When we said justice for Witness, we didn't mean recreate it," while another added, "Here we go again."

For what it's worth, Katy's 2017 hair transformation isn't the only time she's made a drastic change. In fact, the 39-year-old has sported dozens of hairstyles over the years. While she may be most known for her current long, jet black look, she's a natural blonde, and she's donned all types of lengths and colors—including blue, purple, and pink—throughout her career. 

However, fans may be more concerned about the music that would follow a drastic haircut, as Katy has been teasing releasing new music for the first time since 2020, and tends to match her sound to her style. 

One thing fans can be sure of is that her sound and style will continue to evolve. 

After all, Katy even recently revealed she owns a "vault" for her looks of eras past. "Every artist has a vault of sorts and I definitely have a vault," she told E! News in January. "I have one, and there's employees for it."

Katy may have faked out fans on her latest transformation, but read on for more stars who've changed their looks for real. 

The singer debuted a lighter, shorter 'do in April 2024.

Back to blonde: Kim debuted a new platinum 'do in April 2024.

The Fenty Beauty founder debuted a bright blonde hair transformation April 17 while celebrating her latest Fenty x Puma collection in London.

The model debuted a bleach blonde pixie cut at the FRAME event April 4.

The Jennifer's Body star traded in her bubblegum pink tresses for a baby blue bob, which she debuted April 2.

Less than a month afer chopping her hair into a long bob, Zendaya debuted a honey blonde transformation at the Challengers premiere March 26.

The Great star ushered in spring with a fresh cut, as she debuted a long bob March 25.

The Mean Girls alum swapped out her signature blonde hair for a dark brunette transformation on March 18.

The Selling Sunset star looked completely unrecognizable after debuting a dramatic blonde transformation March 16.

The Fashion Police alum ditched her signature purple hair after six years, tinting it an icy silver in March 2024. 

The Dune actress debuted a shoulder-grazing bob at Essence's Black Women in Hollywood Awards March 7.

The Anyone But You star made a showstopping appearance at Miu Miu's fall/winter 2024-2025 show during Paris Fashion Week. For the March 5 event, she unveiled a dramatic long bob haircut.

To prepare for her upcoming role as  Jean Seberg, the 29-year-old debuted a bleached blonde pixie cut.

The Princess Diaries alum unveiled fringe bangs at the 2024 Film Independent Spirit Awards.

The star debuted a bangin' new style at the premiere of her friend Nicola Peltz Beckham's film Lola in February 2024.

The "On the Floor" singer made a dramatic hair change, as she debuted a chin-grazing bob cut at Schiaparelli's haute couture spring/summer 2024 show on Jan. 22.

In January 2024, a month after her prison release, the now-influencer shared a pic of herself sporting a shorter 'do.

Kylie Jenner traded in her dark locks for a pink 'do in January 2024.

In January 2024, the Dancing With the Stars personality shared a video of herself cutting her own hair. "Out with the old energy," she wrote, "and in with the new."

The Underworld actress took the plunge and went full blonde, while also debuting a short bob haircut.

The Daisy Jones & The Six actress debuted jet-black hair on Nov. 2.

The Flamin' Hot director recently showcased her dramatic transformation, debuting a choppy, layered bob on Nov. 9.

The TikToker debuted a fresh haircut, revealing a long bob.

After rocking platinum blonde tresses for years, Miley officially returned to her brunette roots to model Gucci's new collection.

The royal recently showed off her new curtain bangs during a public appearance on Sept. 27.

The actress recently debuted a bright red hair color and equally bold blunt bob haircut.

The supermodel debuted a punk-rock hairstyle at Vogue's World Show during London Fashion Week on Sept. 14

The Pitch Perfect star made a drastic hair change, going from dark brunette tresses to a bright blonde look.

The Scream actress debuted a bubblegum pink style in August 2023.

The son of David Beckham and Victoria Beckham got his head shaved by Selena Gomez's little sister, Gracie Teefey, in August 2023.