•Full Name: Mary Kate Olsen
•Birthday: June 13, 1986 (age 28)
•Parents: David & Jarenette (divorced)
•Siblings: Trent, Ashley (twin), Elizabeth, Taylor (half sibling), & Jake (half sibling).
•Partner: Olivier Sarkozy (married in 2015)
•Current Projects: Elizabeth & James, The Row, Olsenboye, and StyleMint.
• Grew up and attended school in Sherman Oaks, California.
• Attended NYU (did not graduate).
• Is shorter than her twin by an inch.
• Is younger than her twin by 2 minutes.
• As children she had lighter colored bangs than her twin, Ashley.
• Is left handed.
• Used to compete horses and owned two, CD and Star.
• Became the youngest producer in history along with her twin at age 6.
• Co-author of the book Influence
• Was a millionaire by the time she reached age 10 (1996). Estimated wealth in 2004 was $137 million.
• Missed her prom to host Saturday Night Live so the opening of the show featured the cast throwing a prom.
• Has put acting on hold to focus on fashion designing and being a business woman.
• Ran a company called Dualstar with her sister that was started in 1993. Mary-Kate and her twin took over in 2004.
• Was a close friend of Heath Ledger