The finale of "Germany"s Next Top Model."
The bare-breasted women got right in Heidi"s face ... exposing messages written on their chests, like "HEIDI HORROR PICTURE SHOW."
One security guard got a handful of underboob while dragging away one of the women ... perks of the job.
Klum got an eyeful but seemed unfazed. It"s unclear what their beef was with her... or shirts. But who cares? Bewbs!
Credits: MORE ON THE STORY HERE