Where my girls at? Today is national Girlfriends Day, and we're celebrating by rounding up pictures of our favorite celebrities and their go-to girls. Take a look at BFFs Beyoncé and Gwyneth Paltrow, supportive pals Nina Dobrev and Julianne Hough, and sweethearts Cameron Diaz and Drew Barrymore. There's also Jennifer Aniston and her longtime friend and costar Courteney Cox, plus so many more. Click through to see them all!