An A-List celebrity is defined as someone who is at the very top of their field. A household name, someone who is recognised outside of their industry. Take Victoria Beckham, Justin Bieber or Gigi Hadid for example. What they, and many other A-Listers, have in common is that they walk around with a certain confidence. So if you want to give off an A-List vibe and behave like the superstars, that's the most important thing!