Today is National Best Friend Day, and we're celebrating by rounding up pictures of our favorite celebrity buddies. Take a look at girlfriends Beyoncé and Gwyneth Paltrow, supportive pals Robert Pattinson and Katy Perry, and beautiful buds Penélope Cruz and Salma Hayek. There's also Leonardo DiCaprio and his longtime best friend Tobey Maguire, plus so many more. Click through to see them all!
Source: Getty / Kevin Mazur/TCA 2010