If there is anyone who knows about maternity wear it's Heidi Klum. The German supermodel, and mother of four, has unveiled not one, but two new lines, Lavish for A Pea In The Pod and Loved for Motherhood Maternity on Good Morning America on Monday. Incorporating the world's obsession with stretchy leggings, Heidi has designed a unitard which she says is surprisingly comfy. To watch the full segment - click here.