Simon Pegg shares my Birthday exactly - 2/14/1970. Most others I’ve never heard of or aren’t all that, with the exception of Florence Henderson, Gregory Hines and Teller.
Socrates, King George III, and James Callis. It’ll do.
Boris Karloff
Groucho Marx
A bunch of other people I never heard of until I Googled as a result of this thread. For some reason, my name didn’t appear on the list of notables. I’ll have to look into that.
Oh, and Miley Cyrus.
Tina Turner, I’m one year older.
Rich Little, same day, same year.
Pat Benatar, and I’m also a fan
Celebrity’s what I share a birthday with?
Oh you meant celebrities, the plural of celebrity. 
Without even looking at the linked site, I know Tyra Banks has the same b-day as me.
So, if I believe this particular website, I get Brigitte Bardot (nice!), Ben E. King (cool!), Dita Von Teese (naughty!), Ed Sullivan (who I have heard of!), and Thomas Crapper (crap!).
And also a rather larger number of “celebrities” whose fame is probably rather more specialised than the website seems to think it is.
Happy birthday to me!
(No, seriously, it’s my birthday).
No one ever guesses my sign. You would think 1 in 12 would, but no one ever does. Apparently people with my sign are supposed to be tight-assed, neat-freak, Type-As, who make a lot of lists, and alphabetize things. And are good with money. Hah. I am living proof of why that is all malarkey.
[CARIBBEAN ACCENT] Hey, mon, it’s your birt’day! Happy birt’day, mon!* 
*From an old episode of MISSION: IMPOSSIBLE. 
My son has the same birthday as Ed Wood.
Are we doing same say of the same month or is year included?
If year doesn’t matter I share with Peter Sellers, Patsy Cline and Bernie Sanders.
Hey, I know I’m no spring chicken, but I ain’t no Millard Fillmore, either!
Bob Saget
Sasha Alexander
Craig Ferguson
Maureen O’Sullivan
Sugar Ray Leonard
and, ugh, Idi Amin
Also a 19th-century British writer I’d never heard of, Anna Jameson. I like the quote they had from her:
“In morals what begins in fear usually ends in wickedness, in religion what begins in fear usually ends in fanaticism. Fear, either as a principle or a motive, is the beginning of all evil.”
I also share a birthday with one of the New Kids on the Block, but can’t remember which one and can’t be arsed to look it up.
I share mine with Clint Eastwood, he’s exactly 40 years older than me!
Grace Kelly
Anne Hathaway
I sure can live with that 
!
Also:
Nadia Comaneci
Auguste Rodin
Neil Young
David Schwimmer
And:
Charles Manson :dubious:
The Roman emperor Hadrian.
My birthday is the same day, month and year as Halle Berry. And I have to hand it to her. She looks almost as good as I do.
Mao Zedong
Phil Spector (US music producer; handgun user)
Ozzie Smith (St. Louis Cardinals infielder who used to come out onto the field and do a back-flip)
Steve Allen
David Sedaris
Henry Miller
Richard Widmark
Charles Babbage (mathematician and inventor of the calculating machine)
Rosemary Woods (Nixon’s secretary)
Lars Ulrich (Metallica drummer)
John Walsh (television’s America’s Most Wanted and The Justice Network)
I only knew of one, Beth Riesgraf, Parker on Leverage, so did a quick Google search. One name seemed to be on the top of most of the lists that came up. Rupert Grint. And that was just the first of many people I have never heard of.
Three out of the four of the following:
Patrick Stewart
Harrison Ford
Cheech Marin
Julius Caesar
Those are the four I always remember, and then I look it up, and I’m wrong about one of them. So I’ve decided not to look it up any more and be content with those fellows.