There is an Antinous for every part of the Mediterranean world, and so there is one at Versailles. In Egypt he was represented as Osiris, in Greece as Aresteus, in Rome as Vertumnus, in the chestnut grove of Versailles as… Antinous? Well. The only thing in that statue that resembles Antinous is its name; otherwise, its features are amazingly similar to those we find in any other portrait of the youthful Louis XV.
See also Winckelmann: Punishing a Libertine.