PageSix has some Cannes gossip... After months of denying their affair, Rose McGowan and Grindhouse director Robert Rodriguez arrived as a couple to the Death Proof premiere. Rosario Dawson also found love on set and walked the red carpet with Eli Roth, who directed a Grindhouse trailer for a fake horror film. Jessica Simpson also caused a stir at a private yacht party by spending "the whole night following Leonardo Dicaprio around like a lost puppy," says a source. ...