Sons and daughters of stars are fashion's new royalty

They are fashion's new celebrity aristocracy, the sons and daughters of stars who are themselves becoming the kings and queens of the catwalk shows. From Lily-Rose Depp and Will Smith's daughter Willow -- the faces of Chanel -- to the Beckham boys and Sylvester Stallone's two daughters modelling for Dolce & Gabbana, celebrity offspring are luxury labels' new not-so-secret weapon.