People News Mary-Kate Olsen engaged to banker Olivier Sarkozy 03/01/2014 Mary-Kate Olsen, 27, is engaged to banker Olivier Sarkozy, 44, the half-brother of former French President Nicolas Sarkozy. Read More RELATED NEWS From Tokyo to Las Vegas: Taylor Swift's flight to Super Bowl LVIII'Chucky' Season 3 trailer released by USA Network and Syfy'Quantum Leap' Season 2 visits L.A. riots, Salem Witch Trials, and more TAGS: Mary-Kate Olsen