Mary-Kate Olsen Hangs with Olivier Sarkozy's Daughter

Mary-Kate Olsen steps out of an office building with her boyfriend Olivier Sarkozy‘s daughter on Thursday afternoon (August 15) in New York City.

The 27-year-old fashion designer and her twin sister Ashley Olsen arrived back in the Big Apple after spending some time in Norway for the launch of their new fashion line with Bik Bok.

PHOTOS: Check out the latest pics of Mary-Kate Olsen

While abroad in Europe, Mary-Kate and Ashley attended an event to sign autographs for fans to launch the new line of clothes.