28 Facts That You Forgot About Mary-Kate and Ashley Olsen

PHOTO: Designers Ashley Olsen ,left, and Mary-Kate Olsen attend the 2014 CFDA fashion awards at Alice Tully Hall, Lincoln Center, June 2, 2014 in New York.
Gilbert Carrasquillo/Getty Images

Happy birthday, Mary-Kate and Ashley Olsen! Today, our favorite twins turned 28. To celebrate, we took a trip down memory lane and counted down 28 facts about the famous fraternal faces that you may not know.

PHOTO: Stephanie (Jodie Sweetin, left), Danny (Bob Saget), Michelle (Mary Kate/Ashley Olsen), D.J. (Candace Cameron), Rebecca (Lori Loughlin) and Jesse (John Stamos)appear on the March 1, 1994 episode of "full House".
ABC Photo Archives
1. They've Already Had Dentures

Because they lost their baby teeth at different rates, the duo had to be fitted with fake teeth to play a toothy Michelle Tanner on "Full House."

2. They Were Pint-Sized Producers

The twins became the youngest Hollywood producers in 1992. They were 6.

3. The National Academy of Television Arts and Sciences Could Tell Them Apart

While both have since retired from acting, one has enjoyed more critical acclaim than her twin sister. Mary-Kate's work in "So Little Time" was nominated for a Daytime Emmy. Ashley's performance was not so well received.

4. Mary-Kate Has a Running Habit

But she doesn't bother with spandex or sneakers. Instead, she slips into her birthday suit and a pair of stilettos. "I run around my house naked with heels all the time," Mary-Kate told Harper's Bazaar in 2007. "It's so funny. All my friends will tell you I love running around in kimonos and jewelry or naked with jewelry." Stars, they're just like us!

5. Jimmy Fallon and Will Forte Took Them to a Prom

... Well, sort of. Mary-Kate and Ashley missed the high school dance to co-host "Saturday Night Live" in 2004. Fallon and Forte graciously served as their dates in a prom-themed sketch.

6. They Recognize Their Weaknesses

Appearing with Mary-Kate on "Ellen" in April 2014, Ashley admitted: "I don't think we're very good singers." That seems like an unfair characterization. We think "Brothers for Sale" was a very strong album.

7. A Lot of Creepy Men Celebrated Their 18th Birthday

Several websites launched countdown clocks to mark that milestone birthday and the fact that the twins came of age. It was as uncomfortable as it sounds.

8. Mary-Kate Is Still Mastering Basic Grooming

"You know, the truth is I feel like I just learned how to brush my hair like last week," Mary-Kate told Marie Claire in March 2014. See that? Our mother was right after all. You're never too old to learn!

9. The Scent of Coffee Gives Mary-Kate 'the Warm and Fuzzies'

In the same Marie Claire interview, Mary-Kate spoke lovingly of the brew: "It feels like a part of my childhood. It was something that I smelled a lot. It just reminds me of having a routine in the morning."

10. They're Fraternal

Ash is an inch shorter than her sister and has a faint freckle above her upper lip. Mary-Kate has wider eyes and thinner lips than her two-minute-older twin.

PHOTO: Mary-Kate Olsen and Olivier Sarkozy attend the Dallas Mavericks vs New York Knicks game at Madison Square Garden on Nov. 9, 2012 in New York City.
James Devaney/Getty Images
11. Mary-Kate Will Be a 'Cool' Mom

She was spotted smoking alongside her fiance, Olivier Sarkozy, and his daughter. Just kidding. Very uncool, Mary-Kate. Smoking kills.

12. Our Lips Are Sealed

On their "Ellen" appearance earlier this year, Ashley contended that she had her first kiss before her twin sister. Mary-Kate disputed the claim. Ellen did not inquire further.

13. They Were Friends with a Pretty Little Liar

"Pretty Little Liars" actress Troian Bellisario grew up across the street from the Olsens. They lost touch after the duo moved away, but Bellisario went on to play a small part in the straight-to-video movie, "Billboard Dad."

14. Move-In Ready

Mary-Kate and Ashley Olsen sold a $7.3 million Manhattan penthouse apartment in 2005 that they never lived in. We understand. Six thousand square feet and natural light just isn't for everyone.

15. The Write Stuff

Mary-Kate is left-handed. Ashley is right-handed. Michelle Tanner was thus, necessarily, ambidextrous.

16. They Were Not Always Individuals

No, really. "Full House" producers credited the twins as "Mary-Kate Ashley Olsen" in early seasons of the television show. They apparently did not want people to know that the role of Michelle Tanner was played by twins.

17. Ashley Has a Better Memory

On Bravo's "Watch What Happens Live," Elizabeth Olsen told a fan that Mary-Kate forgot her birthday this year. Lizzie assured listeners that she would not hold the slip-up against her sister. "She was out of town!" the younger Olsen reasoned.

PHOTO: Bob Saget and Mary Kate Olsen appear on the Oct. 18, 1994 episode of "Full House".
ABC Photo Archives
18. Diaper Duty

Bob Saget took his role as their on-screen father seriously. In "Dirty Daddy: The Chronicles of a Family Man Turned Filthy Comedian," Saget recalled changing the twins' diapers on set.

19. They Were Trend Setters

Mary-Kate and Ashley were the first twins to share a star on the Hollywood Walk of Fame.

PHOTO: Designers Ashley Olsen (L) and Mary-Kate Olsen attend the 2014 CFDA fashion awards at Lincoln Center on June 2, 2014 in New York City.
Gilbert Carrasquillo/Getty Images
20. They Founded a Fashion Line to Find the Perfect T-Shirt

The twins co-founded luxury label The Row in order to craft a superlative t-shirt. Mary-Kate told The Wall Street Journal that she and her sister decided to launch the brand in response to the question: "How we could make a perfect T-shirt in a great fabric that would fit any age."

21. They're Big in Norway

The twins launched a collection with Norwegian retailer Bik Bok in 2013.

22. It's Kind of Like a Pool Party

The Row's first standalone store on Melrose Place is outfitted with a full-size courtyard pool. The flagship reportedly keeps towels on hand for shoppers looking to cool off.

23. Mary-Kate Sparkles

Olivier Sarkozy proposed to the younger twin with an $81,000 vintage Cartier engagement ring.

24. They Have a Brother

Sister Elizabeth is now famous in her own right, but the twins also have a brother. Trent is a year older than the twins and reportedly toyed with the idea of getting into acting. A childhood friend told the New York Post that the "prankster" sold his sisters' autographed pictures for pocket change in elementary school. Clearly, entrepreneurship runs in the family.

25. Ashley Has a Back-Up Plan

A friend asked Ashley to chop off several inches of her hair this year. Of her skills, Ashley boasted: "She made me do it, but it looks great."

26. Ashley Has a Middle Name

It's "Fuller." Doesn't have quite the same ring to it as "Kate," does it?

PHOTO: Fred Armisen as Betty Faye Olsen, Ashley Olsen, Mary-Kate Olsen during the "Access Hollywood" skit on Saturday Night Live, May 15, 2004.
Dana Edelson/NBC/NBCU Photo Bank via Getty Images
27. They're as Close as Ever

In December 2013, Ashley told Allure that their twin bond is "beyond words." #Aw.

28. Matchy-Matchy

They may be all grown up, but it's never too late to coordinate on the red carpet. The duo donned matching black dresses to attend this year's C.F.D.A. Awards in New York City.

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