"The last time a German looked this hot was when they were pushing Jews into the ovens," Rivers said of Klum, who sported a revealing plunge-neck, backless gold dress at an Oscars party thrown by Elton John last weekend.
But it seems Rivers, 79, known for provocative, catty red-carpet celebrity observations, went too far with the Holocaust comment, broadcast on Monday's episode of the TV entertainment show she co-hosts, Fashion Police.
The Anti-Defamation League (ADL), issued a statement demanding Rivers apologize for her “vulgar and hideous” comment.
“We cannot believe it made it to the airwaves,” said ADL head Abraham Foxman. “Making it worse, not one of her co-hosts made any effort to respond or to condemn this hideous statement, leaving it hanging out there and giving it added legitimacy through their silence.”
“Of all people, Joan Rivers should know better,” added Foxman, referring to Rivers' Russian-Jewish background.
"My husband lost the majority of his family at Auschwitz,” an unrepentant Rivers told The Hollywood Reporter this week.
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“I can assure you that I have always made it a point to remind people of the Holocaust through humor," she added.