Cepheids are the only tracer of the Milky-Way warp with accurate distances over the whole Galaxy. After a brief overview over our current picture of the Galactic warp, I present an analysis of the warp signal in a sample of 2123 Galactic Cepheids with full 6D phase-space information. The main finding is that the Cepheid warp is clearly twisted with a line of nodes forming a leading spiral, as observed for the warps of external galaxies. I discuss the implications of this result in terms of the possible scenarios for the origin/cause of the warp in the Milky Way.