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Rihanna

Oh, was Rihanna on a Hawaiian vacation? I thought she was at Coachella Tweeting pics of herself looking amazing in a denim bikini. Anyhow, she was in Hawaii and she posted the Facebook pictures to prove it. We get it, she looks freaking banging in a bikini. Only problem: She accidentally posted one which exposed her nipple. Hey, it happens to the best of us sometimes. Click on to see the NSFW shot of Ri Ri and more celebs whose nipples have accidentally escaped their clothing. [Gossip Cop]
Milla Jovovich

Pamela Anderson

Janet Jackson

Christina Ricci

Amy Winehouse

Jennifer Love Hewitt

Demi Lovato

It’s was a rough year for Demi Lovato. Rehab, drugs, cutting … and then a nip slip in front of a crowd in Dallas, Texas. Her nip slip happened when she leaned over in a tight fitting dress. Come on, Demi! Everyone knows that’s a bad idea.
Lady Gaga

Lady Gaga is not ashamed of her nipple, she was born this way.
AnnaLynne McCord

Jessica Simpson

Jessica Simpson looks terribly excited to debut her nips on the red carpet.
Keira Knightley

Keira Knightley manages to keep her face awfully couture in the midst of a wardrobe malfunction.
Kirsten Dunst

Kirsten Dunst caught a wave that took down her bikini top.
Mischa Barton

Oopsies! Mischa Barton missed a button.
Paris Hilton

Paris Hilton is too drunk to notice her top has gone missing.
Britney Spears

It’s Britney’s nipple, bitch!
Tara Reid

Tara Reid is an old pro at the nip slip.
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