Shields and Schwartzberg married in 1990 and they were both in their early twenties at the time.
So, if I’m happy in a relationship, I want to keep it private for as long as I can.
Frankel fires off at de Lesseps over her relationship with fiance Tom D’Agostino Jr.
because fellow cast member Ramona Singer had previously dated him.
But a source said: "Kate and Nikolai have gone back to drinking and late nights in Greece - they have fallen off the wagon spectacularly.
"It has left some of her friends worried about her and not a lot of them approve of Nikolai. The Sun on Sunday told in May how Kate had booted Count Nikolai - great great Grandson of Germany's iron chancellor Otto von Bismarck - out of her country home amid concern over his boozing.