The bizarre clip showed Katja lapping up a saucer of milk.
The Leipzig-born beauty is well known for pulling off audacious publicity stunts online.
She has almost a million followers on Instagram after littering her account with scantily-clad photos of herself.
It may be premature to add Katja to that list just yet.
The 26-year-old was engaged to Belgian model and singer Fanny Neguesha, and also dated Italian showgirl Raffaella Fico, who is the mother of his child.