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Kathryn Hahn -

'WandaVision' actress Kathryn Hahn spoke to People for their 2021 "Beautiful Issue" and opened up about when she didn't feel so beautiful. It was after her "goth period," when she had piled on so much foundation that "you  needed a sandblaster to take it off," when she had developed cystic acne. She would struggle to cover it up with tons of makeup on top of the blemishes, and that lasted right up until her 40s, at which point she adopted a diligent skincare routine and her acne started to clear up. 

“Acne really does something to your self-esteem, especially when you’re on camera,” Hahn shared. “Once that started clearing up, I definitely felt more comfortable not wearing makeup.” Now, she says, she's wearing less and less the older she gets. 

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Cardi B -

Cardi B opened up about her "uncomfortable" acne struggles, asking her Twitter followers for advice. “I been breaking out lately and my face is extremely dry. I don’t think these products are working. I think it’s the water out here," she tweeted. She also shared a photo of a breakout on her cheek, writing, "It’s been happening for like 3 months now … S—t really is uncomfortable.” Cardi added that she'd been to a dermatologist but that they didn't help. 

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Justin Bieber - About his acne, the singer shared an Instagram story with a selfie and the caption "Pimples are in."

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Meghan Markle - The Duchess of Sussex swears by tea tree oil. According to Markle, it can be useful to treat a number of things; from mosquito bites, to breakouts.

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Kendall Jenner - Kendall had a tough time dealing with acne. She said she wouldn't look people in the eye and that it killed her self-esteem. Her advice? "Never let that stop you!"

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Demi Lovato - The singer has no problems in admitting she has acne. She posted an Instagram story, not wearing any makeup and with the caption "Can you spot the acne dot?"

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Ethan Dolan - One of the Dolan twins took to Twitter to reveal his treatment for acne. Cutting dairy seemed to have done the trick for him.

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Cameron Diaz - The actress confessed in her book that she had terrible skin when she was a teenager and in her 20s, and discussed how that affected her self-esteem.

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Emma Stone - Stone's acne was so severe that she had to take Accutane (a strong prescription drug) for it when she was a teenager. She also suffered from stress-related acne when she starred in 'Easy A.'

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Miley Cyrus - The singer confessed that she had really bad skin growing up. She stressed how important it is to wash up her face every day, and to wash her makeup brushes.

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Rihanna - Whenever Riri has a breakout, she stops drinking alcohol and increases water intake. She swears by lipstick, to draw attention away from her "flaws."

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Selena Gomez - Gomez confessed that holding the microphone close to her chin makes it worse. She says she puts a mask on and uses a humidifier after the show.

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Katy Perry - The singer told Elle Australia how self-conscious she is about her acne scars and that sometimes she wears too much makeup to cover them up.

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Kaley Cuoco - The 'Big Bang Theory' star has opened up about her insecurity in front of the camera, because she had acne as a teenager.

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Alicia Keys - The singer knows how it feels to "have a face full of bumps and pimples," she said in an interview. Apparently, eliminating dairy and drinking more water helped.

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Lorde - The singer opened up about her acne on an Instagram story. She said it caused some people to give her unsolicited advice, and others just thought she was dirty.

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Chloë Grace Moretz - The actress used to have really bad acne. She recalls a time when a meeting was called to address the issue when she was shooting a movie. Moretz was 13 at the time.

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Keira Knightley - The actress joked about her skin problems. She said: "I always get acne so it's incredibly nice when they take it out digitally. I wish they could do that for me in everyday life."

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Daisy Ridley - The English actress suffers from endometriosis and has polycystic ovaries, which cause skin problems.

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Karlie Kloss - Yes, even supermodels get acne. And they also struggle to avoid popping their zits.

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Megan Fox - The stunning actress has not openly addressed her struggle with acne, but a number of pictures have shown that she suffers from it.

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Nina Dobrev - The actress also has to deal with acne. She confessed that she had even accidentally walked out of the house wearing zit cream.

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Ashley Benson - The 'Pretty Little Liars' star shared a photo on Instagram wearing zit cream.

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Mindy Kaling - The actress is very candid about her acne problems. She posted a photo on Instagram with the caption "That zit cream in your 30's life."

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Naya Rivera - It was not until she was 24 that the 'Glee' star had an acne breakout. She dealt with her adult acne using Proactiv.

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Mandy Moore - Moore didn't get acne until she was in her early 20s. Yet another celebrity that struggles with adult acne.

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Shay Mitchell - The actress pointed out that things such as weather changes and stress can trigger breakouts.

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Lili Reinhart - The actress has been struggling with cystic acne since she was 12.

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AnnaLynne McCord - The actress suffers from adult acne.

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Dakota Fanning - The actress also took to Instagram to share her pimples.

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Belle Lucia - The model posted a photo on Instagram showing how bad her acne was and how much it affected her life.

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Bella Thorne - The Disney star also suffered from acne, and even made a video for Neutrogena about it.

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Zendaya -

Zendaya struggles with hormonal breakouts, and she shared it with the world via Twitter.

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SZA -

The artist uses a Manuka honey mask and hemp oil to keep her cystic acne in check.

Check out the ultimate guide to preventing and treating acne.

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