By SIMON CABLE and GEORGINA LITTLEJOHN Pucker up: Emma Watson shares a kiss with French actor Cyril Descours as they film the new Lancome advertisement in Paris last nightShe's already spoken of her excitement at landing her lucrative new role as the new face of Lanc�me.But it looks like Emma Watson has found another perk to her new job - kissing handsome French co-star Cyril Descours.The Harry