Not only did she drop her new album Stars Dance this week but she turned 21 years old too! What's even better is that she now she shares her big day with the royal baby!
Find out what Selena had to say to ET Online about her birthday party with friends, her new single with that supposed Justin Bieber voicemail in it and sharing her big day with the world's most popular baby by watching the interview above!
Do you think it's cool Sel shares a birthday with Prince William and Kate Middleton's baby boy?
Check out pics from Selena's birthday party over the weekend HERE!