We can't believe that our girl Ciara Bravo is 18 years old TODAY! It seems like just yesterday she was Kendall Schmidt's devious little sister on Nickelodeon's hit TV shows Big Time Rush. But in actuality, those days are long gone and little Katie Knight is officially all grown up.
Despite Ciara growing up, and moving from Nickelodeon to the FOX drama Red Band Society, it seems one thing has remained the same: Her super famous friend group!
Click through the gallery to find out which of your favorite celebrities are part of Ciara's famous circle of friends! Then tell us in the comments: Which celebrity do you wish was YOUR best friend?