Millie Bobby Brown Told Sheer Braless Dress 'Horrendous' As Blonde Bombshell

Millie Bobby Brown has garnered mixed reviews ever since she debuted her blonde bombshell look earlier this year. The Stranger Things star, who recently celebrated her 21st birthday, now has fans thinking she looks 40+, although many are also shading her over her style.

On Thursday, Millie showed off a series of looks while in Madrid, hitting the Spanish city to promote her latest The Electric State movie. Alongside rocking a 2000s-inspired denim look with space buns, Millie went sheer in a glamorous braless gown, one deemed "horrendous" by one fan.

Scroll for all the photos. Ditching her brunette, girl-next-door vibe for a Hollywood bombshell one, Millie shocked fans with her fluffy blonde locks and heavy makeup yesterday, posting the above photo on Instagram. Displaying her fit figure in a slinky embellished dress in silvery-white, the British actress went body-hugging as she showed off her curvy backside, rocking a see-through number with a slight slit at the back.

Adding a navy stole in silk to accessorize her gown, Millie wore drop earrings and diamond ring jewelry, completing her look with highlighter-heavy makeup plus a long manicure. She also shared a throwback photo of actress Gwyneth Paltrow in the same look, tagging the GOOP founder in her caption.

Millie's look also went viral as Just Jared shared photos from her night in Madrid, where costar Chris Pratt and husband Jake Bongiovi joined her.

Fans quickly commented. "She looks like a 55-year-old republican," one said, with another stating that Millie's "hair color" was aging her. They added that she "looks 40." A third, meanwhile, stated: "The photos in her denim outfit is cute. The photos in the dress is horrendous, they age her 30 years."

Also sending Millie Bobby Brown the thumbs-down was the fan writing: "Maybe she's trying old Hollywood glamour.... But it's not working."

Many also called for the Florence by Mills Fashion founder to "fire" her stylist. In the above photo, Millie paid homage to Baywatch bombshell Pamela Anderson as she flashed her cleavage in a plunging silk blouse while posing under a "PAM" sign.

Millie Bobby Brown went @pamelaanderson in her caption for the above snap, but not all of her fans were convinced. Rocking tight leggings and an itty-bitty crop top three days ago, she flashed her abs, quickly getting likened to singer Britney Spears. Some are even speculating that Millie may be cast as the "Toxic" singer in her upcoming biopic.

"The way I neeeed Millie to be cast as Britney Spears immediately," a popular comment read. Follow our Facebook page for more from Millie.