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There's a day for everything these, um, days, so of course there's a special spot on the calendar to celebrate those special people in our lives we call siblings.

Yep, April 10 marks National Siblings Day (make sure to write it down so you don't forget next year), and a number of celebs have taken to social media to post funny, sweet and precious photos of themselves with their sisters and brothers.

Whether they're super throwbacks (like Cindy Crawford's baby pic), a montage of images (like Hilary Duff's cute video) or even a Photoshopped image (good one, Mandy Moore), Hollywood's stars made sure to give a special shout-out to their nearest and dearest.

Check out some of the pics below!

@haylieduff I love you more than words?? #nationalsiblingday

A video posted by Hilary Duff (@hilaryduff) on

Happy National Siblings Day to these two baes @buuski #freeslw and our two little munchkins #mabel&evelyn

A photo posted by Rumer Willis (@ruelarue) on


A photo posted by Scott Foley (@scottkfoley) on

Happy #nationalsiblingday ! Jeff, Danielle and Chris

A photo posted by Cindy Crawford (@cindycrawford) on