In September 2014, Mary-Kate married Olivier Sarkozy in a small private ceremony. Seventeen years her senior, Sarkozy is the half-brother of the former French President Nicolas Sarkozy.
In 2007 Mary-Kate Olsen checked into a rehab for an eating disorder.
In 2012, Mary-Kate and Ashleywon the CFDA Womenswear Designer of the Year award.
In 2004, Mary-Kate and Ashley became sole owners of Dualstar Entertainment Group. The organization was formed around the girls when they were very young by Robert Thorne and Greg Redlitz.
With her sister Ashley, Mary-Kate operates two fashion labels: Row and Elizabeth and James.
Toward the end of their run on Full House, Mary-Kate and her sister Ashley had to wear fake teeth. This was due to the twins losing different teeth at different times and making it impossible for both girls to play one character.
In June 2008 PETA called on its supporters to defend animal rights and sent both Ashley and Mary-Kate hair clippings in protest to their wearing of fur.
The casting director for Weeds once said that he had Mary-Kate go through the audition process twice for her role, just to make sure she was right for it. They didn't think she'd be good enough, because of her and Ashley's reputation for not being the best actresses in the world, but in the end, she really nailed it. This was the first acting role that Mary-Kate took on independently, without her twin sister.
It is said that when Mary-Kate and Ashley first started Full House at nine months old, Mary-Kate was the calmer, less fussy baby, and because her sister was crying all the time, Mary-Kate had to play Michelle for most of the scenes in Season 1.
Mary-Kate was hospitalized in New York for a kidney infection in November 2007.
In August 2007 Mary-Kate stopped her studies at NYU after her classmates kept selling stories to the tabloids.
For the movie, The Wackness, 21-year-old Mary-Kate was required to passionately kiss 63-year-old Sir Ben Kingsley.
Mary-Kate is best friends with fellow actress Eliska Amor. The friends met in the corridors of the HBO building in 2004 when Mary-Kate was a guest on The Tonight Show with Jay Leno. Both girls are called 'fashion icons' for their trendsetting rock-and-roll chic meets runway and share a common passion for c rock music.
Actress Kirstie Alley, who played Mary-Kate's kind and loving social worker in the 1995 film It Takes Two, has said that she feels Hollywood-based pressure may have contributed to Mary-Kate's eating disorder in 2003. "They're in an adult world with adult jobs, and they're basically children," Alley has said of both Mary-Kate and Ashley.
In March 2007, Ashley and Mary-Kate revealed they planned to get matching nose jobs. After Ashley revealed to Mary-Kate that she thought her nose was too big and she was going to have rhinoplasty, Mary-Kate jumped at the idea as well.
As of January 2007, Ashley, together with her sister, Mary-Kate, have released nine books:
Mary-Kate & Ashley In Action!
So Little Time
The New Adventures of Mary-Kate & Ashley
Mary-Kate & Ashley: Sweet Sixteen
Mary-Kate & Ashley: Our Story
Two Of A Kind
New York Minute
Mary-Kate is mentioned in Bowling For Soup's song "High School Never Ends".
Mary Kate's pet peeve is when people make noise eating bananas.
Mary-Kate's height is 5'1".
Mary-Kate attended her dad's wedding while Ashley did not.
Rankings: #3 - VH1's list of the '100 Greatest Kid Stars' (along with Ashley).
#20 - 'Most Wanted Young Star for the New Year' (by Access Hollywood and The-N).
#61 - '100 Sexiest Women Poll' (FHM).
#82 - '100 Hottest Blondes of AIM'.
#70 - '100 Celebs Under 25' (AIM).
Mary-Kate appeared in the 1993 Disney Easter Parade dressed as Snow White along with TV sister Jodie Sweetin who was dressed as Cinderella.
Mary-Kate and her sister, Ashley both missed their high school prom to host Saturday Night Live. The cast made it up to them by giving them a fake prom when they did their monologue.
According to an interview, her perfect day would consist of waking up and looking at the beach on a clear day. She'd go for a jog, run some errands and as the sun is setting get a massage-then fall asleep.
If stranded on a desert island with only three personal belongings, Mary-Kate says that she'd bring lip gloss, music, and water.
Her top choice for dinner would be bruschetta, Caesar salad, and angel-hair pasta.
Favorite Holiday - Halloween.
Favorite Color - Red.
Favorite Accesory - Purse.
Favorite Band - Dave Matthews Band.
Favorite Theme Park - Disneyland.
Mary-Kate received a Daytime Emmy Nomination for her role as Riley Carlson in the TV series So Little Time. Ashley was not nominated.
At age 6, she and Ashley became the youngest producers in history. Just four years later, they became the youngest self-made millionaires in American history, worth about $150 million each.
She has the same birthday as Ally Sheedy, Tim Allen and Malcolm McDowell.
She and her sister, Ashley, have a line of clothing that is sold at Wal-Mart.
She practices Tae Bo and Yoga.
Had a bi-monthly magazine called Mary-Kate and Ashley Magazine, but it ended after just 3 issues.
Mary-Kate has two horses, CD and Star. She enjoys riding them and has won several prizes with them.
Mary-Kate's birth name was Mary Kate Olsen. Since she was the youngest child at the time, her parents called her sister Ashley (rather than Ashley Fuller) and Mary-Kate by her first and middle names. Because she is so well known by "Mary Kate," her name is hyphenated to be "Mary-Kate."
Ashley has a freckle above her lip which Mary-Kate does not.
Mary-Kate and her boyfriend David Katzenberg broke up after 1 year of dating, before both started college– she at New York University and he at Boston University.
Mary-Kate went to Utah for rehab for her dramatic weight loss. It was decided that she had anorexia.
She wears size 6½ (US) shoes.
She dyed her hair a darker color so that people could tell her and Ashley apart, although some people were still unsure who actually dyed their hair in the first place.
Mary-Kate is left-handed.
Mary-Kate is two minutes younger than her fraternal twin, Ashley.
In 1993, she and Ashley were initially supposed to play young Eve girls on The X Files episode 'Eve'. Eventually - because of the strict children's labour law - they were replaced by Krievins twins from Vancouver, British Columbia.
Mary-Kate: (on not acting anymore) I don't have to be a pretty face. I've done that, but now it's important and liberating to be on the other side of the lens. I don't like to be the center of attention anymore.
Mary-Kate: (when asked if people tease her and Ashley about their childhood career) I think it's more that they feel sorry for us...because it's kind of bittersweet. I mean, we were like little monkey performers, you know? I look at old photos of me, and I don't feel connected to them at all. It doesn't feel like me. It feels like a role that I played. I would never wish my upbringing upon anyone...but I wouldn't take it back for the world.
Mary-Kate: (in 2010 about her and her twin sister) We're like two little young old women who have been through a lot. We're turning 24 on Sunday, and I said to Ash, "Can you believe we're turning 48?" We've been working since we were nine months old. That's the way we feel.
Mary-Kate: Australia is so cool that it's hard to even know where to start describing it. The beaches are beautiful; so is the weather. Not too crowded. Great food, great music, really nice people. It must be a lot like Los Angeles was many years ago.
Mary-Kate: (on New York Minute) I learned how to play the drums! When we were in pre-production, when we were still in LA, I had a couple of drum lessons and then some in Toronto. I got the one beat down and that was it.
Mary-Kate: (about taking her SATs) I get extra time to take the test because of my ADHD. Everybody's brains work differently and I just need longer for things to register.
Mary-Kate: (about being cast as a drug addict on Weeds) I've spent the last year going on auditions, acting, and working hard. There will always be my celebrity, but my work speaks for itself.
Mary-Kate: When we were kids, the work we did wasn't about acting. It was about pleasing people and making kids smile.
Mary Kate: I think we've been labelled as role models since we were very young. My sister and I don't look at ourselves as role models - I think that's a huge responsibility. The best we can do is take care of ourselves and experience life for ourselves and not really let the outside world affect us.
Mary-Kate: (about the world in general) I find it very interesting, actually. I think about it all the time. Since I've been in it, and grew up in it, and I've been working since I was nine months old, I don't know any different. But I also......I can't see the other side. It's hard for me to really see how big Dualstar is, or how big everything is. I have to be reminded. Because I'll ask a simple question sometimes of whether or not we can do certain things. And I'll get a look like I'm crazy.
Mary-Kate: I run around my house naked with heels all the time. It's so funny. All my friends will tell you I love running around in kimonos and jewelry, or naked with jewelry.
Mary-Kate: (revealing she is too self-conscious to wear a bikini) I would love to be able to swim in the ocean in Malibu. But that is asking for a bikini shot. That's inviting something that I don't want to happen. I don't need to be on a 'Who's Skinny, Who's Fat, Who's Looking Healthy, Who's Not Eating?' list. I don't want my picture taken. The only time I think it's OK is at a red-carpet event or a photo shoot. So every time I see paparazzi, I cover my face so they don't get a picture, and I'm just 'the mean person who doesn't smile.'
Mary-Kate: I don't want my picture taken. The only time I think it's okay is at a red-carpet event or a photo shoot.
Mary-Kate: I usually do get the tomboy parts in the movies, which is kind of like me, but not totally. I like to shop as much as Ashley, but she is a little more of a girlie-girl than me.
Mary-Kate: I think one day I want to be on the other side of the camera- maybe directing.
Mary-Kate: Me and Ashley feel like we're totally different.
Mary-Kate: When Ash and I are at a premiere and they're taking photos of us, she squeezes my hand 3 times to say 'I love you' and I squeeze her hand back 4 times to say 'I love you too!'
Mary-Kate: (admitting she is inspired by Johnny Depp's unique sense of Weirdly, I look to guys like Johnny Depp for tips. He just knows how to put things together and I love that scruffy rock look.
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