It is reported that the 27 year old striking beauty and fashionsta Mary-Kate Olsen is engaged to her French boyfriend Olivier Sarkozy, half brother of French president Nicholas Sarkozy. The duo has yet to confirm the so called rumors, but lately Mary- Kate was seen adorning a giant four carat sparkler on her finger, while nonchalantly setting out for a walk with twin sister Ashley Olsen. According to trusted sources, after two years of dating and consistent wedding proposals by the 44 year old banker Olivier Sarkozy, the former Full house child star has finally decided to give the wedding a thought. Since they still haven’t gone official with the engagement news, it is a little hard to make out the exact ring, which is believed to be bought from Sotheby’s. It is a vintage ring from Cartier, in thick yellow gold with 16 blue sapphires and white diamonds that combine to form petals of a flower with a round bezel set diamond. The exclusive ring is supposedly worth $81,000 approx. According to sources and pictures, the happy couple is engaged to tie the knot quite soon and as for now they are blissfully settled in their $6 million NYC townhouse. If the engagement rumors are to be true, then Olsen will be the stepmother to the 44-year-old billionaire’s children, Julien, 12, and Margo, 10.