Happy Bey-Day! Though not officially a national holiday, Beyoncé’s birthday is kind of a big deal. For the BeyHive it’s a time to celebrate the birth of the most dominant music star in past decade. As Bey turns 32 years old today (September 4) it’s also a chance for her music peers to give her a shoutout. Click on to see which stars wished Beyoncé a Happy Bey-Day.