We all know the infamous acne commercial where the pimpled victim in question discusses the possibility of eating too many chocolate bars as the cause of his plight.

What you probably don’t know is that June is Acne Awareness Month, which highlights the emotional and psychological damage acne can inflict, not just on us regular folk, but on celebrities too. (Yep, even the celebs wake up with dry zit cream on their face.)

Many of these celebrities have become spokespersons for Proactive, an acne skincare and treatment product. Sean "P. Diddy" Combs probably didn’t want to go on stage at times during his worst breakouts but it clearly didn’t stop him from becoming a successful producer. He, along with “Girl on Fire” singer Alicia Keys, teen pop sensation Justin Bieber and the Princess of Pop, Britney Spears have all wanted to put a bag over their heads at one point (see, they’re mortals too!)

Story continues below the slideshow:

Loading Slideshow...
  • F1 Grand Prix of Monaco - Race

    MONTE-CARLO, MONACO - MAY 26: Actress Cameron Diaz attends the Monaco Formula One Grand Prix at the Circuit de Monaco on May 26, 2013 in Monte-Carlo, Monaco. (Photo by Mark Thompson/Getty Images)

  • Alicia Keys

  • P. Diddy

  • Britney Spears

  • Justin Bieber

  • Keira Knightley

  • Emma Stone

  • Salma Hayek

  • Katy Perry

  • Leonardo DiCaprio

  • Brad Pitt

Fair-skinned beauty Kiera Knightly has also discussed her skin problems, even admitting that she is highly self-conscious about her face. "I’ve got really awful skin," she said. "My on-screen look actually takes about four hours of make-up.

“Amazing Spider-Man” actress Emma Stone, who is also known for her pale complexion, told Refinery 29 that she struggled with hormonal and cystic acne in her teens and when she was 20.

"I'm actually pretty interested in skin care," said Stone, "because I had bad hormonal acne when I was 17, and they put me on Accutane for it. After two months on the Accutane, I went off of it, and since then, my skin, my mouth, my lips, my eyes are all so dry. Then, I had stress acne when I was 20, when I did 'Easy A', which they kindly video-airbrushed out of the movie."

Other seemingly flawless individuals who have been open about their problem skin include actress Salma Hayek, who ate to cope with her depression over her skin and wound up, in her words “fat and broken out”.

Even Vogue covergirls get acne; first-time Vogue covergirl Katy Perry admitted that she never had great skin.

"My skin used to be a lot more worse than it is," Perry told Vogue, "so we would do a lot of coverage cause I was insecure about my skin."

And it's not just women in their twenties who get acne; 40-year-old Cameron Diaz exudes natural beauty but she’s had to shell out major money for her glowing skin. The "Bad Teacher" star battles bad acne and hyper pigmentation by seeing her dermatologist regularly for peels, microdermabrasion and LED light treatments

Don't think that men are exempt from the dreaded pimple.

Leonardo DiCaprio, perpetual supermodel chaser, actually suffered terrible acne when he was a teenager. (He still has the acne scars to prove it.)

Even Angelina Jolie's partner Brad Pitt went through his teen years with pretty chronic acne resulting in his current not-so-pretty scarred skin. Hey, we can’t all be Ryan Reynolds and Halle Berry with their pore-less, perfect complexions.

Also on HuffPost: