She was at a 75th anniversary celebration dinner for Domaine Clarence Dillon's wines, and Prince Robert was the host.
Despite the fact that he was the host
and he's spoken for, he was reportedly by her side all night for the seven course meal, prepared by world famous chef Thomas Keller.
A source has said that a $1,000 bottle has been delivered to Jennifer since the event.
We're sure Princess Julie is thrilled!