Justin Bieber, Robert Pattinson

Tony DiMaio/startraksphoto.com; Larry Busacca/Getty Image

There's a lot to remember at red carpet events, so sometimes, the small details go unnoticed.

Like, for example, zipping up your pants.

Although it may sound silly, a number of stars have been caught suffering from the fly down fate, blissfully unaware of their peekaboo pants as they pose for pics for adoring fans. 

From Justin Bieber to Robert Pattinson to Robert Downey Jr., stars of all ages have fallen victim to the wardrobe malfunction, and we can't help but poke a little fun at these celebs' careless style.

Consider it the male version of a nip slip (unless you're Tara Reid, that is). And remember next time, zip up!

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