The friend confided to People Magazine:
[Image via Instagram.]
So serious, in fact, that the 26-year-old plans to move in with the 43-year-old to the townhouse in New York City that he recently bought!
"They are really, really happy. And Olivier is buying a townhouse below 14th Street, to be with Mary-Kate. We are told they're not officially moving in together - they both think it's too early for that. But he's telling friends that Mary-Kate is the best thing that has happened to him in a long time.”
Well, seeing as these two are only four months in, we're glad that they realize it's a little too early for an OFFICIAL place together!
But this seems like a very big indicator of how well things are going between them!
Best of luck, you two! Enjoy the new digs!