Heidi Montag sends fans in frenzy with single-use jeans only to reveal ad promotes protecting planet

Heidi Klum flashes her pert derriere in sheer black dress with a leather jacket

Sofia Vergara and Heidi Klum look fashionable and glamorous as they head to America's Got Talent set

AGT judges Simon Cowell, Sofia Vergara, Heidi Klum and Howie Mandel get playful on couch together