The heiress, 30, took to her Instagram Stories with snaps from the lavish bash held at the family's huge home in Bedford, New York which had been decorated with balloons.
Universal announced plans to expand their dynasty into Europe for the first time recently, with their British venture planned to open in Bedford in 2031.
Bedford locals have revealed their fury after a deal was closed by the Government for a huge new Universal theme park to officially open in the UK town in 2031.