Hit the brakes, Helen Mirren just debuted a dramatic transformation.

While attending the opening ceremony and Jeanne du Barry screening at Cannes Film Festival 2023 on May 16, the Fast X actress turned heads on the red carpet with a brand-new blue hair color.

Making her entrance all the more exciting, Helen paired her vibrant 'do with a matching baby blue gown by Del Core that featured an off-the-shoulder design, a plunging neckline and a ruched bodice attached to a floor-length train. She added extra oomph to her look by holding up a black fan with the inscription, "Worth It." Indeed, she is.

The Oscar winner, who is no stranger to wowing on the red carpet, recently opened up about her experimental approach to beauty. 

"I don't think there should be any rules and luckily there are less and less," she told British Vogue in an interview published May 16. "Accepting who you are, finding confidence in it and not resisting it is the best beauty advice. You know, the minute you have confidence and you're not trying to be something that you're not, everything about you relaxes...you're happy." 

However, there was a time when Helen admitted to not fussing with her style.

"I always used to cut my own hair, I certainly never dyed it, apart from privately with my L'Oréal Age Perfect Hair Dye," she shared. "But I grew it long during COVID and now I can flick it all over my shoulder. I quite like the fact that it was sort of against the rules for women of my age to have long hair."

She continued, "Your life as you get older gets fuller. You get wiser, too, inevitably, because you know more stuff."

Well, now The Queen actress knows what it's like to rock an electrifying hairstyle. Keep scrolling to see her fabulous 'do, plus other celebrity transformations.

The "Say So" singer showed off her dramatic hair transformation on Instagram, debuting bright purple hair and a spooky spider design on the back of her head.

The Kick-Ass actress debuted a fresh bob haircut, which she hasn't rocked in quite some time.

The American Idol judge revived her signature style of 2008 and revealed baby bangs in a June 20 Instagram.

The Vampire Diaries actress debuted fringe bangs for the Los Angeles premiere of her new film Out-Laws in June.

The "Vogue" singer debuted an edgy shag haircut on June 11.

The Dance Moms alum proved you can be blonde and brunette at the same time with her recent hair change.

The High School Musical alum has entered her French girl era, after showing off her new curtain bangs.

The New Girl alum ditched her trademark brown hair and blunt bangs for a sky-high blonde 'do for her upcoming appearance on the '80s-based Apple TV+ series Physical.

The "Over It" artist headed into summer with a shorter cut and new hair color, debuting her blonde bob to Instagram in May 2023.

The X-Men star kissed her shoulder-length hair goodbye and debuted a pixie cut on May 26.

While attending the Louis Vuitton cruise show in Italy on May 24, Emma debuted curtain bangs—a style she often rocked in the mid-2010s.

The Sweet Home Alabama actress debuted wispy fringe bangs in a stunning selfie. 

The Poosh founder went back to her brunette roots, debuting a new look. As she put it on Instagram, she's a "brunette4lyfe."

Amid her ongoing transformation journey, the Rob & Chyna alum debuted a short pixie cut with shaved sides.

On May 15, the pop star opted for a bold hair color, rocking jet-black hair.

Helen Mirren wowed at the 2023 Cannes Film Festival, as she debuted vibrant blue hair.

Playing Lily Bloom in the film adaptation of Colleen Hoover's It Ends With Us, the actress was seen with red hair while filming scenes in New York City on May 15, 2023.

The Star Wars actress debuted her newly shaved head on May 10, writing on Instagram, "Happy without hair!"

On April 24, the Tangled actress debuted a fresh cut and fringe bangs.

The "Flowers" singer unveiled a drastic hair change, going back to her brunette roots, at The Daily Front Row's Seventh Annual Fashion Los Angeles Awards.

The TikTok star debuted a drastic hair change at Coachella 2023, unveiling a blonde bob look.

Ava Phillippe, the daughter of Reese Witherspoon and Ryan Phillippe, debuted blunt bangs in an April 4 Instagram.

The Elvis star went bald for his role as Feyd-Rautha in Dune: Part Two.

The actress debuted a long bob on April 3 that's perfect for spring.

"@craphairclub hair is giving me so much joy still," the daughter of Nicole Kidman and Tom Cruise shared on Instagram March 29 along with a photo of her 'do. "Thank you."

The Pretty Woman star showed off her fringe bangs and fresh hair color on March 27.

The supermodel debuted a pixie haircut in a March 20 Instagram, while also sharing behind-the-scenes snapshots of her photoshoot with Pop magazine.

The star debuted a red hot new 'do in March 2023.

Kourtney debuted her biggest hair transformation in March 2023.

After reverting back from blonde to brunette, the SKIMS founder zhuzhed up her signature look with curtain bangs.