Why wear one amazing outfit a day when you can wear three? That's what Jennifer Lopez did when she hit the City of Lights yesterday to promote her new film The Back-Up Plan. The actress arrived at the exclusive Hotel de Crillon in a ruffled Etro maxidress, wore a Paule Ka white skirt suit while lunching and shopping in Paris's hip Marais district with her sister (she was spotted browsing at Lanvin and the boutique Bel Air) and finally headed for the airport in a black leather paneled Gianfranco Ferre long-sleeved dress and C. Viviani pyramid cocktail ring. The only thing the fashion icon didn't change? Her black Loewe "Amazona" handbag. Tres chic!