There are few relationships as special as best friends. That unique bond is an integral part of the human experience — best friends enrich lives and, for many, save them too. Best friends are so important that, in 1935, the U.S. Congress decided to celebrate the bond between BFFs every June 8, National Today reported. Since then, National Best Friends Day has encouraged people around the world to spend time with their bestie and tell them they love them. To honor the holiday, we put together a list of our favorite celebrity BFFs. Read on to learn more about their close bonds.