Buzz·Posted on Jun 13, 201226 Must-Know Facts About Mary Kate And Ashley OlsenThe most famous twins in the universe turn 26 today. Here are 26 things you just gotta know about them!by Lauren YapalaterBuzzFeed StaffFacebookPinterestTwitterMailLink 1. They had to wear fake teeth on "Full House" because they were losing teeth at different rates and needed to have the same smile Via tv.com 2. Ashley's middle name is "Fuller" ash-olsen.org 3. Mary Kate is a leftie, while Ashley is a rightie Via tv.com 4. At 6 years old, they became the youngest producers in Hollywood Via tv.com 5. Mary Kate has A.D.D. (Ashley doesn't) Via imdb.com 6. Both of their first on screen kisses were in "Passport to Paris" Via imdb.com With those hotties 7. Mary Kate was nominated for a Daytime Emmy for her work in "So Little Time" but Ashley was not Via tv.com But she was still there to support her sister. 8. They were credited as Mary Kate Ashley Olsen (one person) in the early seasons of "Full House" washingtonpost.com The producers didn't want people to know it was twins playing one role 9. They promoted McDonalds Happy Meals in France Via tv.com In 2004 10. They got their ears pierced for a second time at 16 after both of them got infections at 10 years old and let their holes close up blogger.com 11. Ashley hates the sound of people eating bananas blogger.com 12. Their album "Brother for Sale" sold 325,000 copies View this video on YouTube This was just an excuse to listen to the song. 13. "New York Minute" was Ashley's last acting job images.allmoviephoto.com 14. Also, "New York Minute" was the lowest grossing film in history for a movie opening in over 3,000 theaters images.zap2it.com Made $5.96 million its opening weekend. :( 15. In "Full House" Ashley acted out the more serious scenes, while Mary-Kate took the funnier scenes tumblr.com 16. They are of Danish and Norwegian descent tumblr.com 17. They christened a cruise ship named the MS Zaandam images.dailyfill.com The ship is owned by Holland America Line 18. They were the first twins to get a joint star on the Hollywood walk of fame westcoastconnection.com 19. Ashley is very down to earth and practical Via imdb.com "I am very down to earth and practical" - Ashley Olsen 20. Mary Kate is a prize-winning horse rider 45.img.v4.skyrock.net Her first horses name was CD, as in compact-disc, remember those!? 21. Ashley did not attend her father's wedding to his second wife, only Mary Kate did Via ashandmk.mindenkilapja.hu 22. The bandanas they wore in one of their videos sparked a national trend, which is how they got the idea to start a clothing line Via voices.yahoo.com 23. They won the 2012 CFDA award for womenswear designer(s) of the year tumblr.com 24. They grew up across the street from — and were best friends with — Troian Bellisario AKA Spencer from "Pretty Little Liars" tumblr.com Troian made a cameo in Billboard Dad! 25. They have TINY feet. Ashley with a 5.5 shoe size, and Mary Kate with a 6.5 blogger.com 26. Mary Kate loves running around naked Via hopealexander.hubpages.com "I run around my house naked with heels all the time. It's so funny," she has said.