Clara Ward (1873 – 1916) was a wealthy American socialite who married a prince from Belgium. Her main talents were being beautiful by the standards of the time, and being famous. She combined the two by posing on various stages, including at least the Folies Bergère and probably also the Moulin Rouge, while wearing skin-tight costumes.
Postcard of theater star Clara Ward, ca. 1900s via
FROM THE BYGONE 
Her pose is classic, for its time or any others. She was likely a stage colleague of Marie Doro in the early 1900s, if not in similar silent films later.