Jennifer Aniston and Britney Spears Have Wardrobe Malfunctions

Celebs are notorious for wardrobe malfunctions, which are usually reserved for red carpet events ... or stumbling into a limousine after a hard night of partying at the club.

However, Jennifer Aniston proved it can happen just about anywhere.

The actress has been vacationing in San Cabo Lucas with fiancé Justin Theroux and "Friends" co-star Courtney Cox, where she's been photographed in several bikinis showing off her envious physique.

In a recent barrage of papparazzi snaps, she was spotted relaxing by the pool donning a lovely teal two-piece. At some point, she pulled her bikini straps down to avoid unsightly tanlines — no big whoop, right?

Well, if it weren't for the twins trying to make a cameo appearance, we'd move on to something more juicy, like predicting Miley Cyrus' plans for New Years' Eve. But honestly, Jen, let's reign'em in, shall we?

Speaking of wardrobe malfunctions, Britney Spears had one of her own.

During a recent performance in Las Vegas, the 'Circus' singer's sequin dress nearly fell off!

While she was totally aware the back of her dress was totally unzipped, she continued singing and dancing. After all, the show must go on!

Fortunately, her dancers knew how to handle the situation. Someone in the audience caught the incident on Instagram. Click here to see for yourself!