I just learned that John Force and I both have May 4th for our birthdays!

 I already knew Audrey Hepburn, because before the internet, she was the only one famous enough to be mentioned on Entertainment Tonight's daily celebrity birthday announcements 

https://en.wikipedia.org/wiki/John_Force  John was born in 49, same year as my mom

Now that the internet has data gathered all the info and stats, it's a matter of just asking an AI program who was born on any particular day, to learn about the celebs that share your birthday. 

So, here are some others that I share my birthday with, just fwiw

Richard Jenkins (terrific role in Cabin In The Woods) 

Will Arnett (most fun Batman!) 

Randy Travis

Mick Mars

writer Robin Cook, most famous for Coma (1977) OutBreak (1987)

Dick Dale (Misirlou)