Selena Gomez turned the big 2-1 today, a momentous occasion shared by the arrival of Prince William and Kate Middleton's royal baby.
And, as it turns out, the singer/actress is just as obsessed with the news of the day as the rest of the world.
"It's surreal," gushed Gomez of sharing a star sign with the Duke and Duchess of Cambridge's first-born son. "We'll have joint birthday parties or something!"
And speaking of birthday parties, the 21-year-old star marked her passage into adulthood with a sexy new party video to accompany the track Birthday from her new album Stars Dance, in stores tomorrow.
Check out the fun video (and hear all about the story behind it) above!