"Project Runway" host Heidi Klum flashed her butt while showing her Instagram followers her painful sunburn on Saturday.

Heidi Klum Bares It All on Instagram
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In the revealing photo, the 40-year-old model is seen pulling down her bikini bottoms to reveal the sunburn, and pretty serious tan line. She captioned the shot, "Ouch!"

On July 5, the mom of four also took to Instagram to show off her new head of cornrows, referring to herself as a "Bahama Mama."