beauté du diable
/bəʊˌteɪ duː dɪˈɑːbl(ə)/(also beaute du diable)
noun
Beauty that is associated with youth; especially transient and superficial attractiveness and charm, often associated with a mischievous or rakish personality.
Origin
Early 19th century; earliest use found in Harriette Wilson (1786–1845), courtesan. From French beauté du diable, lit. ‘devil's beauty’ from beauté + du of the + diable.