Taking care of business with her twin sister, newly-engaged Mary Kate Olsen left an office building in New York City on Monday (March 3).

The "Full House" star showed off her new bling as she headed outside while her talented twin Ashley Olsen stayed by her side.

As previously reported by GossipCenter, late last month the half-brother of the former French president popped the question to the pint-sized media mogul.

They may have a 17-year age gap, but the two have been going strong since spotted together back in 2012. Previously, Olivier was married to Charlotte Bernard, with whom he shares two children.