When you're suffering with a breakout so bad that you don't want to leave the house, it's good to know that you're not alone. Spare a thought for the celebs who can't cancel a concert or press conference just because they're having a bad skin day! Sometimes it's comforting to know just how many total sex goddesses struggle with living out their daily skin battles under the glare of the paparazzi:

Katy Perry:
"One of my insecurities is that I have acne scars. I'm self-conscious about that so sometimes I wear too much makeup to cover them up. When you suffer with blemishes, you don't feel very free."

Keira Knightley:
"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."

Keira Knightley bad skin acnepinterest
Getty Images

Lorde:
She regularly shares photos of her skin trials – whether it's how her real problem skin is photoshopped to make it look perfect (above), or sitting in hotel rooms covered in spot cream. Her message to her fans: "Remember, flaws are OK."

Lorde acne bad skinpinterest
Twitter.com/lordemusic

Cameron Diaz:
"I mean, I had terrible, terrible skin. It was embarrassing. I used to eat a cheeseburger and fries every day. But once I stopped, a funny thing happened…my skin began to clear up."

Cameron Diaz acne bad skinpinterest
Rex

Rihanna:
"When I feel like my skin has had it, I cut out all alcohol and overdo the water. And lipstick is essential – it draws attention away from any flaws."

Rihanna acne bad skinpinterest
Rex
Headshot of Kate Turner
Kate Turner
Beauty Editor
I’m Cosmo’s beauty editor and get paid to test beauty products for a living – amazing huh? Seriously, you can’t move in my bathroom for STUFF. I’ve interviewed everyone from Cheryl Cole to the Beckhams for their beauty secrets and I love to guess what perfume you’re wearing (Me? I’m an Estee Lauder Bronze Goddess kinda girl).