Millie Bobby Brown Running In Skimpy Bikini Told She 'Got Fat'

Millie Bobby Brown has been body-shamed as a stunning photo shows her joyfully running across a beach. The actress, 21, was recently featured on an X repost as she wowed in a skimpy swimsuit, but she likely wouldn't want to check the comments. Showcasing her fit and curvy figure in a teeny two-piece, Millie dashed across sands as she enjoyed an oceanfront vacation, showing the body that endless users compliment for looking "natural." One hater, however, seemed in the mood to torment the Stranger Things star as they wrote that her backside "got fat."

Scroll for the photo. Modeling a yellow bikini with a high cut and cheeky thong finish, Millie grinned as a person running alongside her caught the moment on their smartphone camera.

Looking her all-natural self as she padded around barefoot, the Florence by Mills Fashion founder sizzled with a reminder of her curvy backside, also showing off her shapely legs and toned waist as she took her workout outdoors.

Screwing her face into an adorable smile as she let her bob hair blow around in the breeze, Millie flashed her built biceps and shoulders in a halterneck top, opting for some support, plus a frilly waistband that further accentuated her midriff. The mom of one, who made 2025 headlines for adopting a baby girl with husband Jake Bongiovi, completed her look with lightweight makeup, also sporting a deep red lip.

"Nice," one fan replied. Another sent Millie a red heart emoji. A third, however, trolled the actress, saying that her backside had gotten "fat."

Millie Bobby Brown went viral in minutes last February as she debuted her blonde makeover. Ditching her brunette locks for extravagant, blow-dried hair as she wore heavy makeup and a sophisticated wardrobe, the TV star largely received negative reviews, with many saying that the makeover had aged her. In this photo, she stunned in a braless glittery dress, flashing her toned shoulders on Instagram.

Millie Bobby Brown was back in baby doll mode for this shot late last year as she promoted her Florence by Mills Fashion brand, launched in 2024.

"I wanted to be able to create something that was accessible to my generation, to my demographic so that when they go into a store, they feel like they have that one corner—even if it’s a corner in the back—that they have what they’re looking for, and they’re able to afford it," she told Ellewhile discussing her label.

Millie went all snow bunny in the above photo, posing in a fuzzy, comfy sweater and sheer stockings while going pantless. Millie is also founder of her Florence by Mills cosmetics line and Florence by Mills Coffee.