Heidi Klum proved she’s the hardest-working supermodel in the business, dancing in 4-inch heels with a broken toe as she shot a recent campaign for Jordache. We’re told Klum, who fractured the digit on a concrete umbrella stand in May, worked with choreographer Mia Michaels, a former judge on “So You Think You Can Dance,” on the routine while wearing the lofty heels. The Rankin-photographed ad spot will be airing nationally at the end of August.