From nip slips to side boob to full-on flashing, HollywoodLife.com has rounded up some of the most shocking wardrobe malfunctions of 2013! Which one do YOU think is the most embarrassing?

Celebs like Rihanna, Selena Gomez and Lindsay Lohan definitely put the oo in oops this year! Each of these stars bared more than they bargained for in 2013, but if anyone is going to reveal a little something extra, it may as well be these sexy celebs!

Best Wardrobe Malfunctions Of 2013 — Most Outrageous Slips Of The Year

Rihanna, 25, has never been shy about showing off her rocking body, but the 25-year-old superstar took things to a whole new level when she shared a series of very racy Instagram pics that ended in a wild wardrobe malfunction!

RiRi took to Instagram to post 12 photos of herself striking sexy poses in nothing but diamond-studded pasties and a thong for her “Pour It Up” music video. But the raciest pic of all was one where her breasts were almost completely exposed! In the photo, Rihanna’s nipples are barely hidden by studded diamonds, resulting in a pretty flashy nip slip. RiRi’s daring look proves that diamonds really are a girl’s breast friend!

Lindsay Lohan Caught Showing Major Sideboob

We have to hand it to Lindsay Lohan, who pulled off the wildest, most gratuitous display of sideboob in the history of sideboob in 2013! Cameras snapped away as the 27-year-old star stepped out on Sept. 13 to visit her mom, Dina Lohan, who had just been arrested for a DWI.

But when Lindsay put her breasts on almost-full display outside her family’s home, the real story became less about Dina’s arrest, and more about her daughter going braless in a plunging black tank top! Lindsay really is a master at driving us to distraction!

Selena Gomez Accidentally Exposes Her Underwear

Poor Selena! The usually classy and covered up pop princess was performing at a concert in Boston on June 30 when she suffered an unfortunate wardrobe malfunction. Selena, 21, looked pretty in a yellow and black dress, but her vigorous dancing caused her to flash her Spanx underwear — how embarrassing!

And that wasn’t even the first time Sel accidentally exposed her underwear on stage, as she also revealed her Spanx at the 2011 Jingle Ball!

Hopefully Selena — and the rest of these lovely ladies — will be a bit more careful next time!

So HollywoodLifers, who do YOU think had the most embarrassing wardrobe malfunction of 2013? Let us know!

— Tierney McAfee

More Celebrity Wardrobe Malfunctions:

1. Rihanna Defies ‘Wardrobe Advisory,’ Flashes Under Boob At Grammys
2. Anne Hathaway ‘Devastated’ After Revealing Wardrobe Malfunction
3. Jennifer Lopez’s Wardrobe Malfunction — Nip Slip On Stage? New Pic