A 34-year-old mother of three being named the world's sexiest model sounds unlikely, unless that woman is Heidi Klum, who also happens to be one of the most successful global brands in the industry.

"The icon they call Heidi Inc. is no mere sexy mortal, but a force of nature. All hail!" gushed the Models.com Web site that crowned Klum top model and named TV diva Tyra Banks fourth sexiest model.

It's no wonder these two TV titans took down the competition. Klum and Banks are more than runway strutters, they're brands who've changed the face of the modeling business as we know it. "They've broken the mold and diversified, successfully doing things they're actually good at," says image consultant and former model Sandy Dumont.

In the '90s, supermodels like Cindy Crawford and Naomi Campbell tried to break away from the runway with roles on the big screen. (Anyone remember Crawford's flop, "Fair Game"? We thought not.) But Klum and Banks redefined the model slash actress cliché and instead created a platform that actually flies: model slash host.

As "Project Runway" producer and host, Klum has become an international tastemaker, while talk-show host Banks has morphed from swimsuit model to role model.

"They're hardworking, three- dimensional women who haven't disgraced themselves with drugs or bad boyfriends," says Dumont. "They're beautiful, rich, famous - and nice."