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Happy birthday to you and you and you: Why Sept. 9 is the most common birthday

This is the real labor day.
Five babies on quilt
Nine months after the temperature drops, maternity wards get busy.Getty Images

The most common birthday in the United States, according to data collected over two decades, is September 9.

That's right, it's the real labor day!

What is the most common birthday?

More babies have been born on Sept. 9 than any other day of the year, according to data compiled by statistician Nate Silver’s site, FiveThirtyEight, based on registered births in the U.S. from 1994 to 2014.

Counting backwards, that puts the most popular date of conception around November-December — a nice time to snuggle up together under the covers as the temperatures drop outside.

Michelle Williams
Michelle Williams, at The Tony Awards on June 11, 2023, is one of many celebrities who share a Sept. 9 birthday.Kevin Mazur / Getty Images

A less scientific metric is the sheer volume of famous people born on this date.

Celebrities born on September 9

Four-time Oscar nominee Michelle Williams (1980) and three-time Razzie winner Adam Sandler (1966) share the birthday.

Adam Sandler
Adam Sandler at the 2023 Mark Twain Prize for American Humor presentation on March 19, 2023 in Washington, DC.Taylor Hill / WireImage

So do British actor Hugh Grant (1960), American actor and comedian Bill Murray (1950), "Modern Family" actor Eric Stonestreet (1951) and Canadian crooner Michael Bublé (1975).

Hugh Grant
Four weddings and a birthday? Hugh Grant, Sept. 9 birthday boy, at the premiere of "Dungeons And Dragons: Honor Among Thieves" on March 26, 2023.Axelle/Bauer-Griffin / FilmMagic

There are enough sports figures to fill an All-Star-caliber birthday party.

Among them, Cleveland Cavaliers star J.R. Smith (1985) and Super Bowl-winning quarterback Joe Theismann (1949) were born on Sept. 9.

Legendary Russian author Leo Tolstoy (1828) and the late, great “(Sittin’ on) The Dock of the Bay” singer Otis Redding (1941) were also born on the esteemed date.

Otis Redding
Otis Redding performs onstage in 1966.Michael Ochs Archives / Getty Images

And the real secret recipe behind Kentucky Fried Chicken? Whatever aphrodisiac Colonel Sanders’ father fed to his mother nine months before September 9, 1890, when KFC founder Harland Sanders was born.

Sept. 9 astrological sign

People born on Sept. 9 have the astrological sun sign of Virgo, just like Beyoncé, whose Sept. 4 birthday puts her once again ahead of the trend.

Typical traits of Virgos include attention to details, a patient attitude and a gentle spirit. The ability to share their birthday is a plus!

This story was originally published on Sept. 9, 2017, and has been updated.