Favourite Dar Re Mi had to settle for third in Qatar Prix de Royallieu at Longchamp.
The filly - sent off a short-priced favourite - had finished second to the Arc favourite Zarkava at the track almost three weeks ago, and struck for home once in the straight.
Having travelled powerfully she appeared to have made a race-winning move before Andre Fabre's Balladeuse and La Boum swept down her outside to fill the first two places.
Winning rider Olivier Peslier said: "She accelerated very well having been tapped for speed on the descent.
"While some of the others got bumped coming through the field she got a clear run down the outside, and is an improving filly."