“The empress of beauty,” Jean Cocteau called Helena Rubinstein, who though no beauty herself built a cosmetics empire that brought her vast wealth. Visionary when it came to makeup and its modernization, she was also an eclectic and voracious collector. The mahJ features more than 300 paintings, sculptures, tapestries, photographs, books, garments, etchings, and objects in this exhibition, the first in France devoted to the extravagant Rubinstein. —L.J.