Our favorite baby-faced crooner Justin Bieber turns 18 today and we’re celebrating with the world’s biggest celebrities. From George Clooney to Adele to Barack “President of the United States” Obama, we’ve gotten signed birthday photos from everyone you care about. Oh and that’s not all. (But it never is with us, is it?) Every single celebrity pictured agreed to don Justin’s signature hairdo for the sake of an absoultely awesome gallery.