At 30 years old, Taylor Swift has spent quite a bit of time in the spotlight. In fact, we've been able to see the singer grow up right before our eyes — from her breakthrough as a 16-year-old country star to her reinvention into a full-blown pop icon. We've watched as she dated other stars (like John Mayer and Harry Styles) and befriended, and sometimes unfriended, other celebrities. Let's look back at her incredible evolution.