Pour Moi snatched victory in the shadow of the post to land the Investec Derby at Epsom from Treasure Beach and the Queen’s Carlton House.
Mickael Barzalona, 19, gave the Andre Fabre-trained colt an ultra-confident ride and dramatically celebrated before the line as he got up to win the premier Classic at his first attempt.
Pour Moi (4-1) pipped Treasure Beach (25-1) by a head with Carlton House, the 5-2 favourite, three-quarters of a length away third.
Joseph O'Brien, also making his Derby debut, set the pace on Memphis Tennessee, trained by his father Aidan.
He held a six-length lead with big outsider Marhaba Malyoon as they made the descent to Tattenham Corner, where Ryan Moore was pushed wide on Carlton House.
Treasure Beach, another O’Brien runner, hit the front with Carlton House trying to make his bid and Native Khan and Recital not far behind.
But Pour Moi came from even further back to launch his bid and grab the spoils, giving the Coolmore triumvirate of John Magnier, Derrick Smith and Michael Tabor the first and second.