It's not the first time the mother-of-four has set temperatures soaring. Last week she posed naked behind a curtain for a photo taken by her musician husband, Tom Kaulitz, 31.
She stood with her arms out and looked down as she pressed her chest against the sheer blinds.
She simply captioned it "Mondazzzze" followed by love heart and smiley face emojis.
While the post clocked nearly 200,000 likes, Klum had turned off the comments.
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It comes after she copped flak over another topless photo she shared from her honeymoon in August last year.
"All I see is WATER," she captioned the photo that showed her wrapped in a towel, her hair blowing in the wind – with a glimpse of her exposed nipple.
But some fans called the picture a cry for attention.
"All I see is a midlife crisis," one follower scoffed.
"Yes you are beautiful, but I still do not want to see everything of you," another said.
"Could you ever behave like an adult woman?" one person wrote.
Another commented: "It's getting too crazy with her."
Most, though, supported Klum, mocking those who had been upset by her flash of nudity.
"Imagine being triggered by nipples. Wow. Such obscenity. Y'all need to calm down and stop making a huge deal of women's bodies. Period," one wrote.
"#nipplealarm," one commented, along with several laughing face emojis. "We love a confident woman!"
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"A very nice picture Heidi. We've all seen each other before, move on," another wrote.
Klum and Kaulitz were dating for nearly a year before tying the knot in a secret ceremony last February.
The couple organised a second ceremony on August 3 in Capi where they welcomed friends and family to celebrate their love on-board the Christina O, the yacht belonging to Jackie Kennedy Onassis' second husband.
She's not the only supermodel who has copped it from keyboard warriors recently, with Cindy Crawford also being targeted.
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A little bit of lake light ✨🇨🇦
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After sharing a bikini-clad picture of herself last year, the 53-year-old US supermodel had a few online commenters get their claws out.
"You are old now. I don't think you are living in reality," one person wrote.
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"Getting a little old for this," another commenter said, adding a cringing emoji.
Crawford was one of the most popular models of the 80s and 90s, appearing on the cover of many magazines including Vogue, Elle and Cosmopolitan magazines. She didn't respond to the cruel comments, though her adoring fans were quick to defend her.
