Ever wonder what it's really like to live like a model? ET goes behind the catwalk with an exclusive look at "Model.Live," a new Web series on www.Vogue.tv that follows three up-and-coming models on their way to fashion shows around the world.

The daily lives of Austria of the Dominican Republic, Cato of Amsterdam and Madeline of North Carolina are chronicled on the series, from the moment each walks out the door on to professional coaching, casting calls, hair and makeup trials, late-night fittings -- and finally the catwalk. The journey begins in New York City with Mercedes-Benz Fashion Week and continues through the fall shows in London, Milan and Paris.

You can catch "Model.Live" at www.Vogue.TV when the 12-episode series, presented by Express, premieres Tuesday. And after every episode, the story continues on Bebo.com/modellive, where each model updates her profile daily with video diaries, text messages, photos, blogs, schedules and more.