Mary-Kate Olsen 's massive diamond sparkler  has been making the rounds across multiple countries  since her engagement to Olivier Sarkozy  late last month, but we haven't seen the couple together until now. They stayed close at a Diane von Furstenberg-hosted release party for author Bob Colacello's new book on Monday in NYC, both wearing black ensembles; in fact, they wore very similar-looking lace-up dress shoes to the bash as well. During the party, Mary-Kate stopped to chat with the author as he signed a copy of his book, Holy Terror: Andy Warhol Close Up, for her as she showed off her ring.
Though Mary-Kate and Olivier haven't spoken out about their wedding  plans yet, they may be planning another big step in their relationship — a baby. The couple is reportedly already trying to get pregnant , in spite of Mary-Kate rejecting Olivier's first proposal a year ago so that they "didn't move too fast."