Petra Nemcova looking just stunning on the red carpet at the Cannes premiere of “Un Conte de Noel.”  Sean Penn, who this year is head of the Cannes festival jury, comes to the film extravaganza bringing his own romantic plot. It might be titled “Three Women and a Fest”, or words to that effect, with Penn facing his current wife, Robin Wright Penn;  ex-wife, Madonna and 2008 Oscar date, gorgeous Petra Nemcova all in the space of a week.