Lindsay Lohan, Katy Perry, Courteney Cox, Bikini

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On this National Bikini Day, we hope you get the chance to celebrate by throwing on your favorite two-piece and hitting the pool or the sandy shores of a fab beach!

And with so many of us working hard to get our bikini bodies in shape, we can certainly understand why tons of gals decide to show off the fruits of many hours at the gym by slipping into a sexy swimsuit.

But before you sport that itsy-bitsy, teeny-weeny two-piece, take a quick minute to learn from these celebs' botched bikini outings!

These famous bathing beauties have taught us that wardrobe malfunctions aren't strictly reserved for red carpet gowns. On the contrary, slippery swimwear can expose more than just toned abs and shapely legs, especially if you're not careful.

But whether these beach babes have suffered a nip slip or accidentally bared their backside, there are a few precautions that any style-savvy gal can take to avoiding showing off too much of her killer physique.

If you hate tan lines, like a certain television star we spotted on the shores of a Puerto Rican beach, we can definitely understand the inclination to undo your bikini's strings while you soak up some sun. But the problem comes when you try to redo the straps and end up revealing more skin than you meant to.

How about slipping into a bandeau top without neck straps instead? Or calling on a gal pal to help you suit up so that you don't have to juggle trying to tie sets of string while simultaneously trying to shield yourself?

Many of us suit up to swim, but raging waters can often interfere with a swimsuit staying in place. While it can be hard to predict whether Mother Nature is going cause your top or bottom to shift in the shores, it's a pretty safe bet that when you're climbing out of the pool, the weight of the water might prevent your bottom from coming up with you.

In fact, we've caught a Grammy-nominated singer and a Fast and the Furious star accidentally baring their bums as they stepped out of the water. A well-placed hand on those bottoms could have prevented these full-moon moments.

See what other mistakes famous bikini babes have made, and see if you can guess who had each embarrassing swimsuit slip-up!

PHOTOS: Guess the celebrity bikini wardrobe malfunction 

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