86-year-old actress and athlete Jane Fonda at the Cannes Film Festival

At the Second Act premiere and opening ceremony on May 14, Fonda wore a stunning Elie Saab appliqué and beaded jumpsuit and animal print coat. But our eyes were on her feet — more specifically, her Margaux Mary Jane flats in mirrored silver patent leather. Mary Janes are a stylish alternative to uncomfortable pumps or more casual ballet flats and instantly dress up different outfits. Even a simple jeans and tee look gets a fresh update when you slip a pair on before leaving the house. Fonda’s not the only celeb to wear them, either — Katie Holmes was recently spotted in New York in a pastel blue pair from ATP Atelier.