Stefani offers a lesson in French dressing at Cannes's amfAR dinner in France. Plus: Pippa Middleton, Ashton Kutcher, Cameron Diaz and more

GARDEN PARTY

Gwen Stefani makes another trés chic arrival – this time in a custom L.A.M.B. gown – at Cannes's annual amfAR Cinema Against AIDS dinner at the Hotel du Cap-Eden Roc in the South of France on Thursday.