Mary-Kate Olsen's latest companion just so happens to be the half-brother of recently unemployed French president Nicolas Sarkozy. Olivier Sarkozy, 42, is managing director of the Carlyle Group and has been dating 25-year-old Olsen about one month, the New York Post reports. The couple is "head over heels," apparently, and spent Memorial Day weekend together in the Hamptons. Olsen, who also once dated Greek shipping heir Stavros Niarchos, was most recently in a relationship with artist Nate Lowman, the Daily Mail notes. The divorced Sarkozy, who has two children, just broke up with actress Stella Schnabel in March.