10. Khloé Kardashian
Luckily, the X Factor host's self-proclaimed "nip action" was rather tame. But, during her first live show, Simon Cowell still couldn't help quipping, "I think the air conditioning is on high tonight."
9. Joann Krupas
The repeat reality TV personality (Dancing With the Stars, The Real Housewives of Miami and Poland's Next Top Model) accidentally gave a peep show while donning an itty bitty bikini at the beach.
8. Bethenny Frankel
The former Real Housewives star learned a valuable lesson on Anderson: Don't take on a push-up contest in a dress. Thankfully, she was wearing undies and laughed it off, asking, "How did it look?"
7. Kanye West
Wardrobe malfunctions aren't just for the ladies: The rapper (and Kim Kardashian's boyfriend) experienced a pants snafu that exposed his thigh while the two were out on a dinner date in the Big Apple.
6. Kris Kardashian
Wonder Woman is known for many invisible things...apparently bra included. Keeping Up With the Kardashian's matriach tweeted her Halloween costume, to which Khloe responded, "Hi nips. That's my mom."
5. Lindsay Lohan
The Liz & Dick wardrobe department had plenty of Elizabeth Taylor wigs and chic, retro dresses. What they didn't have? Pasties, which became evident during this oh-so-dramatic scene opposite Grant Bowler.
4. Emma Watson
Hermoine herself left plenty of people feeling, uh, perky when she showcased serious side boob at The Perks of Being a Wallflower premiere. She clearly thought ahead though, coming equipped with a pasty.
3. Katy Perry
Raging Waters wasn't lying when they named their park. After one intense slide ride, the "Part of Me" songstress showcased a full moon when a certain part of her (her bottom) suddenly lost its bikini cover.
2. Sofia Vergara
The Modern Family star found herself in quite the predicament when, 20 minutes before the show won an Emmy, her dress split. "Thank you emergency team!!!" she joked, before adding, "Jajajajja. I luv my life!!!!"
1. Jennifer Lopez
Consider her the queen of nip slips—at least for 2012. The former American Idol judge and "Dance Again" singer suffered not one but two catsuit malfunctions this year on tour. Maybe she'll invest in some double sided tape next year?