The Danish actress and model drank directly from a bottle of cheap Popov vodka and also from an unlabeled mini bottle. She smoked cigarette after cigarette, and later stumbled to the grass where she appeared to pass out.
Wearing skin tight jeans and matching purple T-shirt and baseball cap, Nielsen finally left the park by walking through some thick bushes instead of using a pathway.
The scene was shocking for those who witnessed the 6' tall Nielsen, who looked at least a decade more than her 49 years.
Nielsen had a very public battle with the bottle after her 1987 divorce from Stallone -- they were married just two years -- and she most recently was in rehab in 2007.
Married five times, Nielsen has been a popular celebrity on the European reality show circuit for the last decade. She was a contestant on the German version of Dancing with the Stars in 2010 and I'm a Celebrity...Get Me Out of Here! in 2012.
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She was absent from last month's funeral of her former stepson Sage Stallone.