The science behind why Sydney Sweeney is the sexiest woman in the world from the ‘rule of 3’ to the perfect ratio

SHE'S super-talented, stunning and has a much-anticipated new film out next month - so it's no wonder Sydney Sweeney is the toast of Hollywood right now.

The 25-year-old Euphoria TV star is the name on everyone's lips as she rises to become one of tinsel town's top actors and is set to play the central role in new horror flick Immaculate, out March 22.

She also recently hit the headlines after sparking romance rumours with co-star Glen Powell due to their sizzling chemistry - rumours both dismissed - and is in a long-term relationship with fiancé Jonathan Davino.

Brains and beauty, the star is credited as one of the industry's hardest workers, with her second-to-none work ethic, even persuading her parents to relocate to Los Angeles when she was just 14 by presenting them with a five-year business plan.

This led to bit parts in the likes of 90210, Grey's Anatomy and Handmaid's Tale, before her big break in HBO's Euphoria in 2019, playing Cassie.

Since then, the beauty has been no stranger to hard graft working 18-hour days, sometimes seven days a week, and recently starring in a slew of high profile projects, including a lead role in White Lotus.

Oozing confidence in bucket loads

Professional successes aside, Sydney is constantly complimented for her beauty - with many hailing her as one of the sexiest women in the world.

And while she oozes talent, personality and confidence in bucket loads, there's actually a scientific reason why she's perceived to be so stunningly beautiful.

According to plastic surgeon , it's down to an intriguing 'golden ratio' when it comes to the proportion of Sydney's physical features.

Dr Gilleard says: "The beauty of Sydney Sweeney is rooted in the fact that her facial features are symmetrical and closely aligned with perfect harmony and proportion.

"These ideal facial proportions are often referred to as the 'golden ratio.'

"The golden ratio in facial proportions can be applied both horizontally, known as the “rule of fifths,” and vertically, known as the 'rule of thirds'."

'Classic beauty' calculation

Casting an expert eye over Sydney's facial features, Dr Gilleard notes there are multiple 'ratio rules' when it comes to size and shape, and the actress ticks nearly all the requirements to create 'classic beauty'.

Dr Gilleard explains: "In addition to the overall facial harmony, individual features have their own specific ratios and dimensions that contribute to attractiveness.

"The rule of thirds dictates that the length of the forehead should match the length of the nose, which in turn should equal the distance between the bottom of the nose and the chin. 

"For example, an attractive female nose, when viewed from the side, should have a gentle curve, its projection (the amount it protrudes from the face) should be approximately two thirds of its length, and the angle between the nose and the lip should fall between 95-100 degrees.

"When viewed from the front, the nasal width should be equal to the distance between the inner aspects of the eyes, and the nasal tip should comprise one third of the total nasal width."

Additionally, ideal lip dimensions include a width 1.6 times that of the nose and a ratio of the vertical height of the upper lip to that of the lower lip of 1:1.6.

Dr Gilleard adds: "The ideal chin position is considered to be approximately 1mm behind a vertical line dropped from the upper lip.

"Finally, high, well-defined cheekbones are a significant indicator of female beauty.

"When analysing Sidney Sweeney's face, nearly all of her facial features adhere to the golden ratios described above, which is why she is referred to as a “classical beauty.” 

More than 'a dumb blond with big t**s'

In the past, Sydney famously declared the biggest misconception people have about her is she's just "a dumb blonde with big t**s."

And actually, the Anyone But You actress was so hung up on her chest size at one point, she considered reduction surgery when she was in high school.

Speaking to Glamour, she said: "I used to feel uncomfortable about how big my boobs were and I used to say that when I turned 18, I was going to get a boob job to make them smaller.

"My mom told me: 'Don’t do it. You’ll regret it in college' and I’m so glad I didn’t. I like them. They’re my best friends."

And it turns out her decision to stick to her natural beauty and not undergo the surgeon's knife was a wise one.

Dr Gilleard says: "In addition to Sidney Sweeney's facial beauty, she possesses a stunning figure.

"The golden ratio can also be applied to breast shape, waist anatomy, and the ratio between the buttocks and waist.

"Once again, when we analyse her figure using these ratios, she meets all the criteria."

'Flaunt what you got!'

While this explains elements of her physical attractiveness, the star is a huge advocate for promoting body confidence - regardless of ratios or societal beauty ideals.

In a previous interview, Sydney said: "Flaunt what you got. Own it.

"I want to show girls that it’s amazing and beautiful and empowering to have the bodies that we have.

"Everybody’s body is beautiful. When you are confident and you’re happy within is when it really shows to other people."

Dr Gilleard agrees, adding: "With images of aesthetic ideals becoming increasingly prevalent on social media, clients seeking plastic surgery often bring in photos of their favourite celebrities.

"While this can be helpful in determining desired outcomes, it's crucial for people to understand that the purpose of cosmetic surgery isn't to make them look identical to someone else.

...having a Sydney Sweeney nose for example is not equivalent to having a 'Rachel from Friends' hairstyle."

Dr Gilleard

"Instead, it aims to correct clearly defined anatomical abnormalities or reverse changes caused by the ageing process.

"Altering one's facial features to match someone else can lead to issues because, as discussed earlier, facial harmony relies on specific ratios.

"Something I often emphasise these days is that having a Sydney Sweeney nose for example is not equivalent to having a 'Rachel from Friends' hairstyle."