Celebrate National Best Friends Day With Your Favorite Celebs Who USED TO Be Best Friends!

National Best Friends Day at Miller-Keystone Blood Center | 2015

Happy National Best Friends Day!

Taylor Swift and Katy Perry may celebrate the holiday, but they won"t be doing it together.

The pair were thick as thieves until one of them broke the girl code

Find out exactly what happened between former celeb BFFs like Taylor and Katy, Paris Hilton and Kim Kardashian West, and more

CLICK HERE to view "Celebs Who USED TO Be Best Friends!"

CLICK HERE to view "Celebs Who USED TO Be Best Friends!"

CLICK HERE to view "Celebs Who USED TO Be Best Friends!"

CLICK HERE to view "Celebs Who USED TO Be Best Friends!"

CLICK HERE to view "Celebs Who USED TO Be Best Friends!"

[Images via FayesVision/WENN.]

Tags: bestiez, gallery, katy perry, kim kardashian, paris hilton, taylor swift

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Source: http://perezhilton.com/2016-06-08-national-best-friends-day-celebrities-former-bffs-taylor-swift-katy-perry-kim-kardashian-paris-hilton