Katy Perry Wears Nothing Beneath Her See-Through Dress In London

Katy Perry kept festive in red last year as she hit up London, U.K., for Capital's Jingle Bell Ball. In December 2024, the singer showed off her slimmed-down figure at the event, posing in a glittery red dress with daring sheer panels.

Exposing her abs while rocking a long gown, Katy kept sparkly in her sleeveless look, turning heads with her weight loss while showing plenty of skin.

The 40-year-old was, at the time, already sparking Ozempic rumors, with these continuing into 2025. Ahead, see the photos, plus snaps of Katy's staggering weight loss.

Scroll for the photo. Looking super-slim while highlighting her tiny waist, Katy stunned in a racy, deep-red dress with a thigh slit.

Going sheer around the midriff and above the bust, the "Woman's World" hitmaker teased her cleavage while going braless, showing hints of her curves as she kept classy.

Showing some muscle definition amid fan allegations that she doesn't work out, Katy braved a low waistline, adding ruched accents from her skirt as she flashed one of her toned legs.

Wearing pointed-toe stilettos in black, Katy added height to her frame in heels, completing her look with a clutch purse and her dark hair worn down. Glamming up for her big night, the mom of one sported plenty of pale matte makeup, adding a deep, bold lip stain, plus cheek blush.

Katy's night quickly went viral on The Daily Mail, where fans jumped to comment. Most commented on the star's changing shape. "Lost way too much weight. She looks gaunt," one said, with over 100 others agreeing. Another agreed, saying that they hoped Katy was "well." A third, meanwhile, said: "Well, she is rich and she isn't a youthful 25 anymore."

"Her hair was always dyed dark. But it's sad how changed her face looks. She was never fat and could've lost weight without Ozempic," they added. Katy Perry joins stars including fellow singer Christina Aguilera and mogul Kylie Jenner in being accused of using the weight loss drug, however, she'd never confirmed taking it.

Over 90 fans upvoted a comment reading: "She didn't do herself any favours losing weight with Ozempic or similar." In 2024, Katy made headlines for revealing that she eats a ton of hard-boiled eggs, but there was still no mention of Ozempic.

Katy Perry was in Melbourne, Australia, last year when she showed off this ab-flashing, blue dress.

Flashing a huge smile for the cameras, the fiance to Orlando Bloom teased her tiny waist in her skintight number, once again sparking talk about her shocking new appearance. Follow our Facebook page for more from Katy!