Mary-Kate Olsen Flashes Huge Engagement Ring at Louis Vuitton Show with Sister Ashley

Mary-Kate Olsen shows off her huge diamond engagement ring as she arrives at the Louis Vuitton show as part of the Paris Fashion Week Womenswear Fall/Winter 2014-2015 on Wednesday (March 5) in Paris, France.

It was just revealed that the 27-year-old fashion designer is engaged to her boyfriend Olivier Sarkozy, 44.

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

Congrats again to Olivier and Mary-Kate on the news!

Also joining Mary-Kate at the show was her twin sister Ashley – the duo arrived together and headed inside as they walked past mobs of fans.