Selena: It's 'Surreal' To Share Royal Birthday

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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.

Pics: New Parents Kate & Will Over the Years

"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.

Related: Selena Gomez Reveals Her Celeb Crush

Check out the fun video (and hear all about the story behind it) above!