What Bra Size Is Katie Donnelly?

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Katie Donnelly is an American YouTuber popular for being a part of the It’s The Donnellys family vlogging channel. She also runs a solo channel with a strong emphasis on lifestyle and beauty videos.

Aside from being a swimmer, level nine gymnast, and vlogger, she also has a great taste in fashion. I’ll talk about Katie Donnelly’s bra size and how it compares to those of other online celebrities.

What Bra Size Is Katie Donnelly?

Katie Donnelly’s bra size is 32A. This indicates her bust measures 32 to 33 inches. She needs to wear bras with A cups and bands that range from 28 to 30 inches.

Graphic image of Katie Donnelly with 32A bra size wearing a white spaghetti strap blouse and blue shorts

This is a common bust measurement among teenagers. For instance, her fellow internet sensation, Charli D’Amelio, also wears a 32A bra. Meanwhile, Donnelly is one band and one cup smaller than YouTuber Christen Dominique, who has a 32B bra size.

Katie Donnelly can use 30B and 34AA as sister sizes. Her history as an athlete helps her burn fat quickly, which results in less breast tissue. She also keeps her upper body muscles defined for core strength.

Benefits of Small Boobs

Can Wear Unlined Bras

When compared to padded bras, a bra without padding like unlined bras simply have one piece of fabric across them. Unlined bras are different from lined bras, as they typically do not provide much support, so they are perfect for A-B cups. If padded bras bother you, especially on humid days, wearing unlined bras will help your breasts cool off quickly.

Don’t Have Side Boobs

If you love wearing tank tops, bikini tops, and sleeveless dresses, side boobs can get in the way of having a flawless silhouette. When your breasts are small, there’s less of a chance you have to worry about the dreaded side boob. You can wear anything without thinking about if it can cause bra bulges.

Can Easily Sleep On Your Stomach

Another advantage of having small breasts is that you can comfortably sleep on your stomach without it being painful on your chest. There’s no need to toss and turn at night to prevent squashing your breasts. It’s also fairly easy to choose sleep clothes.

Drawbacks of Small Boobs

Need to Stuff Bras to Fill Out Certain Tops

Do you recall stuffing tissues inside your bra in middle school or high school? Some women might have to continue this far into adulthood. There are foolproof ways to stuff a bra, such as layering with another bra or inserting socks within the cups, but it can sometimes be a pain to resort to these methods.

Sports Bras Can Flatten Breasts Too Much

Sports bras are a must-have in every woman’s wardrobe, even if you have small breasts. However, some sports bras, like minimizers have the potential to flatten your chest by compressing more breast tissue. It’s like watching your small breasts disappear once you wear a sports bra.

Have a Less of a Figure

Small breasts can give your physique a straight, slim appearance. If your shoulders and hips are the same width, having a flat chest can also make you feel shapeless. Because of this, you might find yourself gravitating towards wearing push-up bras for small breasts most of the time.

Bra Size Measurement & Cup Size | A, B, C, D, DD Bra Sizes AND Extra Large Breasts


The bra size of Katie Donnelly is 32A. She has small breasts, which is normal for gymnasts and swimmers like her. Instead of wearing bras, you can use bralettes and some wireless bras suit this bra size.


Allena is the Founder and Editor of The Better Fit, a platform dedicated to empowering women with practical advice on bras and fitness, inspired by her own revelation of the widespread issue of incorrect bra sizing. Her expertise and tips have been recognized by major publications such as Cosmopolitan, Better Homes & Gardens, Insider, and NBC, making her a trusted voice in women's wellness and lifestyle.