Heidi Klum pulls back the curtain in her new documentary, On & Off the Catwalk, with an inside source spilling all to Woman's Day.

In “On & Off the Catwalk by Heidi Klum,” a new two-part documentary series, viewers are given a rare behind-the-scenes look at Klum’s world, together with two of her four children, Leni, 21, and Henry Samuel, 20.