Even though Taylor Swift, 31, is one of the most famous faces in the world, she’s managed to keep her relationship with Joe Alwyn — whose 30th birthday is today, Feb. 21 — out of the public eye. The two have been dating for more than four years now, but have only been photographed together on a handful of occasions. As they’ve been privately building their life together, fans have been able to get a glimpse into the relationship thanks to Taylor’s song lyrics.