Found wore down main market rival Ervedya to clinch the Prix Marcel Boussac at Longchamp for trainer Aidan O'Brien and jockey Ryan Moore.
A winner on debut before finishing a close third in the Moyglare Stud Stakes at the Curragh three weeks ago, Found was the 9-4 favourite in Paris and always travelling sweetly on the heels of the leaders.
Following a sedate early gallop, outsider Thank You Bye Bye went to the lead to raise the tempo before the home turn, but Jean-Claude Rouget's Ervedya was the first of the big guns to commit for home.
Found swiftly went in pursuit and wore her down in the last 100 yards to seal an ultimately comprehensive victory.
Found's fellow Irish raider, Jessica Harrington's Jack Naylor, ran a fine race in third.
There was disappointment mixed with the joy though as in the following race O'Brien's Gleneagles was demoted from first place in the Prix Jean-Luc Lagardere and placed third, with Full Mast promoted to first.
Commenting on Found's impressive performance, O'Brien said: "She is a lovely big filly, with a temperament to match, and I would think she will have no trouble getting a mile and a quarter and maybe a mile and a half, as she is by Galileo.
"She has plenty of natural pace, certainly enough to be a Guineas filly, knowing that she will hopefully get better over further" - Aidan O'Brien on Found
"Along with that she has plenty of natural pace, certainly enough to be a Guineas filly, knowing that she will hopefully get better over further.
"I'd imagine that will be it for the season, but the lads will decide. She's a very exciting filly."
Coolmore partner Michael Tabor, in whose colours the winner ran, said: "She is a horse for next year and hopefully will be even better as a three-year-old.
"She will definitely get further than this and I thought she did it really well today, even though the ground might have been a little bit firmer than ideal."