They may look plumped and fluffed to perfection on the red carpet, but we're not fooled by all the glitz and glam. There have been more than a few celebrity moments that had us clutching our stomach and running to the nearest trash can.

From the worst celebrity kisses, to stars tossing their cookies and showing a little too much skin, these are certainly some of the most nauseating celebrity moments.

Did we leave anything off of our roundup? Let us know in the comments!

Loading Slideshow...
  • Katy Perry

  • Courtney Stodden

  • Janice Dickinson

  • Adrienne Bailon

  • Justin Bieber

  • Snooki

  • Justin Bieber

    The teen pop star must not have been feeling well on Sept. 29, 2012 as he puked onstage in the middle of a song. Bieber was performing in Glendale, Ariz. -- the first stop on his Believe concert tour. Later that night he tweeted, "Milk was a bad choice! Lol."

  • Lady Gaga

    Mother Monster tossed her cookies on Aug. 16, 2012, while performing at her Born This Way Ball in Bucharest, Romania in front of 35,000 people. Halfway through the show, Gaga ran offstage to throw up and came back, <a href="http://www.youtube.com/watch?v=X1zUJYaFnkc">telling the crowd</a>, "I went backstage and vomited, and I did not want you to see this ... it happens to me sometimes."

  • Rihanna

    RiRi ran off the stage to puke while performing in Portugal in December 2011. She later posted the whole story on Twitter, <a href="https://twitter.com/i/#!/search/?q=rihanna&src=typd">writing</a>, "yep, i ran off stage to throw up, halfway thru What's My Name ... made it back juuuust in time for RudeBoy."

  • Caleb Followill

    In July of 2011, the Kings of Leon frontman got ill during a concert in Dallas, Texas, but let the crowd know before it was going to happen. "I'm gonna go backstage and I'm gonna vomit, I'm gonna drink a beer and I'm gonna come back out and play three more songs," he said. But, Followill never came back, much to the disappointment of his fans and his band members, brothers Jared and Nathan and cousin Matthew.

  • Adele

    She may have the voice of an angel, but Adele is actually terrified to perform live. The singer admitted to <em><a href="http://www.usmagazine.com/celebrity-body/news/adele-i-puke-quite-a-lot-before-going-on-stage-201159">Vogue</a></em> that she suffers from stage fright and almost always throws up before performing. "I puke quite a lot before going on stage... Though never actually on stage," the Grammy winner clarified, adding, "But then, I sh*t myself before everything ... The bigger the freak-out, the more I enjoy the show!"

  • Katy Perry

    <a href="http://perezhilton.com/2009-02-18-katie-perry-puked-at-the-brit-awards#.UGtRXvk-vDU">Reportedly</a>, Katy Perry puked at the 2009 Brit Awards shortly after winning in the Best International Female category. "I'm so sick right now, but they said I should show up because something special might happen. Thank you to everyone at my record label. I proved I work pretty hard because I want to die right now," said Katy in her acceptance speech.

  • Taylor Momsen

    The now 18-year-old "Gossip Girl" star puked onstage when she was 16 after battling food poisoning. While performing with her band the Pretty Reckless, Momsen got sick, but managed to continue singing. "It was so hot, 102 degrees or something," she <a href="http://music.ninemsn.com.au/blog.aspx?blogentryid=645567&showcomments=true">told BBC Radio 1</a>. "I went onstage in a leather jacket being stupid -- I have to wear my leather jacket. I almost threw up in the middle of the second song. I was spewing in my mouth and swallowing it back down and I kept turning around and singing." TMI.

  • Billie Joe Armstrong

    The Green Day frontman has <a href="http://www.xfm.co.uk/news/billie-joe-armstrong-and-dave-grohl-have-puking-competition">had many incidents </a>onstage, the latest being at the iHeartRadio Festival in Las Vegas where he flipped out at producers for telling him to end the band's set. After calling out Justin Bieber, Armstrong smashed a guitar and then threw it into the audience. Days later, he <a href="http://www.huffingtonpost.com/2012/09/23/billie-joe-armstrong-meltdown-getting-treatment_n_1907624.html">checked himself into rehab </a>for substance abuse.

  • Michaele Salahi and Neal Schon

  • Angelina Jolie and James Haven

  • Janice Dickinson

  • Meryl Streep and Sandra Bullock

  • Spencer Pratt and Heidi Montag

  • Steven Tyler And Carrie Underwood

  • Paula Abdul and Simon Cowell

  • Gene Simmons and Shannon Tweed

Also on HuffPost: