Answer: Today is their birthday!

That's right, March 1 is a special convergence of strangely awesome celebrity birthdays. Not only is today the day Justin Bieber turns 17, but it's also the birthday of the man who shot Bieber on CSI, Supernatural's Dean Winchester, Saved by the Bell's Zack Morris, musical superstar Ke-Dollar Sign-Ha and more. Here's a quick list of the many awesome celebs celebrating their birthday on March 1, 2011.

-Canadian pop superstar and newly de-mopped Justin Bieber is 17

-"Tik Tok" singer and Mick Jagger lover Ke$ha is 24

-Supernatural star and object of countless fan fic Jensen Ackles is 33

-Saved by the Bell star and large cell phone enthusiast Mark-Paul Gosselaar is 37

-No Country for Old Men Oscar-winner and pageboy haircut innovator Javier Bardem is 42

-CSI star who shot and killed Justin Bieber on TV George Eads is 44

-300 (and, sadly, Watchmen) director Zack Snyder is 45

-General Hospital's mob boss Sonny Corinthos, Maurice Bernard, is 48

-Wing and Private Practice star Tim Daly is 55

-Apollo 13 director and Arrested Development narrator Ron Howard is 57

-Growing Pains star and singer Robin Thicke's dad Alan Thicke is 64

 -The A-Team's Face, Dirk Benedict, is 66

-The Who frontman Roger Daltrey is 67

-Calypso singer and outspoken political crackpot Harry Belafonte is 84


(Image courtesy of CBS, NBC and the CW)