Unless you're living under a rock that's out of WiFi range, you know that sheer is a huge trend right now... but since the clothes are, you know, see-through, there are a lot of ways to mess up this trend, even if you're a celebrity!

While many famous faces have been rockin' sheer outfits lately, some ladies just aren't quite getting it... and to help you avoid making that same mistake, we've got some sheer no-no's for you to avoid. 

Sarah Jessica Parker could have had a totally classy look in her white dress, but wearing a black bra with that see-through, lacy top portion?! Bad choice!

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On the other hand, Kristen Stewart covered up a bit too much with her nude dress with carefully-placed black embroidery... it kind of just looks like she's wearing a bunch of spider webs.

However, Rihanna may have made the biggest mistake of all, wearing a sheer bandeau (ahem, with nothing underneath) and high-waisted skirt. We're used to seeing Rihanna in some pretty risque outfits, but usually we don't have to go so far as to censor the photos! Eep.

Click through the gallery to check out some more sheer disasters!

Which celeb do you think made the biggest mistake with their sheer?!

Photos Courtesy of: Fame/Flynet  and Getty Images