The 41-year-old model has been letting Von Bismarck, 28, secretly stay in the basement of her former marital home in North London in order to stop him from crossing paths with her staff or daughter Lila, 13, reported Female First.
"A lot of people know Kate has been seeing a lot of Nikolai, but she's never been this open. Their relationship is pretty intense and he has been virtually living at her London home, but has been staying in the basement quite a lot," a source said.
The blonde stunner's rumoured new romance comes just three months after Moss split from her musician husband Hince, 46, four years after they tied the knot.
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