French 1000 Guineas heroine Beauty Parlour was denied a Classic double as the Johnny Murtagh-ridden Valyra ran out a shock winner of the Prix de Diane at Chantilly.
Although unbeaten in two previous starts, Jean-Claude Rouget's Valyra was allowed to start at 25-1 as seemingly the least fancied of three runners for the Aga Khan.
The previously unbeaten Beauty Parlour was sent off the 5-6 favourite and looked likely to collect for odds-on backers when cruising to the front at the top of the home straight under Christophe Soumillon.
But while she beat the rest of her opponents comfortably, she could never shake off Valyra, who eventually wore down the market leader to claim the Group One prize.
Aidan O'Brien's Kissed cut out the early running under the trainer's son, Joseph, but dropped away tamely in the straight and was virtually pulled up, beating only one home.
Stablemate Up fared a little better under Ryan Moore, but was still well beaten into seventh place having been at the rear of the field through the early stages.