Sassy starts underneath, and these sexy stars have stripped down to their skivvies … In honor of National Underwear Day, put your celeb knowledge to the test and guess whose undergarments … one panty at a time!

Keepin’ it comfy, reality TV stars, singers, actresses and everything in between, celebs like Kim Kardashian know no limits when it comes to baring her SKIMS, but can you pick out her famous curves from our hot lineup?

And, Miley Cyrus simply “can’t stop, won’t stop” flaunting her fit physique, but can you score her all-white skivvies look?