They started dating in 2012 and were rumored to be engaged in 2014 when she was spotted with a gigantic ring on her finger.
They've rarely spoken of their relationship in public but she did say once, "Everyone has an opinion.
If you're curious to know more about them, we've gathered a few interesting details about their relationship below.
is an American fashion designer, businesswoman, author, and former actress and producer.
She began her acting career one year after her birth, sharing the role of Michelle Tanner with her twin sister Ashley Olsen in the television sitcom, Full House (1987-1995). In 1993, the production company Dualstar Entertainment Group was founded, which produced a long string of TV movies and direct-to-video releases featuring the girls; they starred in Passport to Paris (1999), Our Lips Are Sealed (2000), Winning London (2001), Holiday in the Sun (2001) and in the television series, So Little Time (2001-2002), for which she was nominated for a Daytime Emmy Award for Outstanding Performer in Children's Programming.
They starred in, Getting There (2002), When in Rome (2002), The Challenge (2003) and made cameos in Charlie's Angels: Full Throttle (2003).
The last film she starred in with her twin sister was New York Minute (2004).
"She's clearly very excited about the chance to get married to a very successful, well-educated man, but life isn't always that simple.
He's already got kids and is very happy with his status in life."Of course, a little looking never hurt anybody.Mary-Kate Olsen was spotted sporting a gold ring on her left ring finger Sunday, and rumors have been swirling about the accessory's implications for the designer, 26, and boyfriend Olivier Sarkozy, 43.Whatever the case, the mere suggestion that the pint-size twin could be headed down the aisle anytime soon prompted us to take a look back at her past suitors.In fact, the source says the Frenchman is "wary" of tying the knot a second time.(He divorced Charlotte Bernard in 2010; they share son Julien, 12, and daughter Margot, 10.)"Mary-Kate is just 27 but comes across as a lot, lot younger," says the Sarkozy source.Mary-Kate — who was 25 at the time — had reportedly been complaining about "boys not being mature enough for her," and after just one month together, the two were "head over heels" for each other.