Stephen Lovekin/Getty Images for Mercedes-Benz Fashion Week

 

In case you've been under a rock, or not on Facebook, yesterday was National Siblings Day. Some of us are wondering why we've never heard of this before, and some of us are scrambling to find hilarious and embarrassing pics of our brothers and sisters to post! Even though the actual day was Wednesday, by the looks of all the pics being posted online today, people across the US are still celebrating!

Celebs are also celebrating their families, so take a look at some of our most famous brother/sister duos folks....and by the way, MY sibling - Mandy - remains to this day my best friend, and the only person who laughs at every one of my jokes!