Marvel at Sebastian Stan's new look.

TheCaptain America star unveiled a major hair transformation on CapitalVaultApril 28, stepping out to the Los Angeles premiere of Thunderbolts*—in which he reprises his MCU role of Bucky Barnes a.k.a. the Winter Soldier—with a shaved head.

However, Sebastian kept the same facial hair he had been seen with in recent months, rocking some scruff on his chin and cheeks.

It appears the 42-year-old, who wore a dark gray suit and slate-colored shirt to the red carpet movie screening, buzzed off his hair for his part in Fjord, a Cristian Mungiu-helmed drama set in Norway.

Of course, this wouldn't be the first time Sebastian altered his appearance for a movie. Most notably, he gained 15 pounds in order to play a young Donald Trumpin 2024's The Apprentice, a role that earned him an Oscar nomination.

"I had people tell me I don't look like him," he told Entertainment Weekly in October, explaining that getting fit for his various Marvel projects over the years made his cheeks "more hollow."

"So, I called a nutritionist who I worked with before, and I said, 'How do I quickly get bloating in my face,'" Sebastian continued. "He was like, 'Then what I need you to do is get ramen and put a bunch of soy sauce packets in the ramen and start having that, and you're going to get the salt in the face."

He also started drinking a vast amount of soda to prepare for his role as the 45th and 47th president of the United States, who is a huge Diet Coke fan. 

"I actually started drinking a lot of Coca-Cola," Sebastian told Entertainment Tonightlast year. "If you drink four Coca-Colas a day, a lot of things happen to your body. Don’t do it."

To cap it all off, the actor worked with makeup artists Jason Collinsand David Williams, as well as hairstylist Barry Lee Moe—who all had helped him morph into drummerTommy Lee for the 2022 series Pam & Tommy—to put the final touches on his transformation into the commander-in-chief.

But as Sebastian noted to EW, "I was always trying to steer to less prosthetics because I didn't want to go with a complete likeness. I wanted to go for the essence."

For more dramatic celebrity hair changes, keep reading.

The Marvel actor said goodbye to Bucky Barnes' signature long hair in April 2025, showing off a shaved head at the Los Angeles premiere of Thunderbolts*.

In March 2025, the "Karma" singer debuted her rainbow mohawk at the GLAAD Media Awards. 

In a March 2025 TikTok video, the model called this 'do with shaggy bangs the "worst haircut of my life."

The Gypsy Rose: Life After Lockupstar debuted a short bob in March 2025, more than two months after giving birth to her and fiancé Ken Urker's first child, daughter Aurora Urker.

The formerly blond Real Housewives of Salt Lake Citystar debuted a red bob on Watch What Happens Livein January 2025.

The model debuted lighter locks in September 2024, a month after giving birth to her and Justin Bieber's first baby, son Jack Blues Bieber.

The Emily in Parisstar debuted her dramatic transformation at the world premiere of her new horror movie, MAXXXINE, in June 2024. 

"Changing my hair always brings out different sides of my personality and I love playing around," Lily told Vogue. "This cut and color feels bolder and yet somehow lighter. And completely more me—right now."

While attending Chanel's Tribeca Film Festival Artists dinner in June 2024, Katie debuted a subtle, yet striking transformation of rich caramel balayage highlights that were blended throughout her brunette tresses.

The Kardashiansstar debuted a platinum blonde look anda bob haircut after rocking waist-length strands for quite some time.

"Did someone say they missed king kylie," Kylie teased in the caption of her June 8 Instagram post, to which her sisterKhloe Kardashiancheekily replied, "I did! I did!!!!!!"

The former Bravo star debuted a platinum blonde look during 2024 Paris Fashion Week Haute Couture.

The Heads of Statestar debuted a drastic haircut—a shoulder-grazing bob—while attending a Bulgari event in Rome i May 2024. 

In May 2024, the actress chopped her hair into a bob that many fans on social media said reminded them of one of the looks she sported as Mary Camden on the '90s series 7th Heaven.

The Transformersactress returned to her dark brown tresses and debuted a sassy bob in May 2024, a month after she dyed her hair blue to enter what she dubbed her "Jedi era."

At age 17, the daughter of the late Anna Nicole Smithdebuted a new lob hairstyle overnight during 2024 Kentucky Derby weekend, which she attended with dad Larry Birkhead.

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

The Fashion Policealum debuted a blonde bombshell hair transformation May 8.

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 Bodystar 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 Challengerspremiere March 26.

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

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

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

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

The Duneactress 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 Diariesalum 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 Lolain February 2024.

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