Mary-Kate Olsen And Olivier Sarkozy Make A Stylish Post-Engagement Debut!

OMG! How sweet are they together??!
Mary-Kate Olsen and Olivier Sarkozy were ultra sophisticated and totally in love at the book launch party for Bob Colacello‘s “Holy Terror: Andy Warhol Close Up” at the Diane Von Furstenberg Studio on Monday in New York City.
What a way to make their debut as an engaged couple!
And eyewitnesses say that MK was just glowing as she flaunted her HUGE rock.
Obviously the workout the petite darling is getting with that giant diamond on her trot around the globe is WELL worth it. LOLz!
[Image via AP Images.]