A big hat tip with a flourish to Girl Scout Gone Bad for finding this wonderful early reference to the above moniker...
Bucks County (PA) Gazette
April 4, 1896
[This article was an item about the surprise announcement of a
long-standing engagement of some European notables, and included a
first-person account of M. Reszke's fiancee]
Jean De Reszke's Fiancee
...I have been engaged for seven years to the Comtesse de Donlaine,
the divorced Comtesse de Maillu-Nesle.
..My fiancee is devoted to the theater...She has a beautiful voice,
and is perhaps the best amateur singer in Paris.
...Her personal appearance? She is a Venetian blond...