Paris Saint Germain lost three players in the first half as their Ligue 1 title celebrations were postponed courtesy of a 5-1 defeat at Lille.
The champions, who needed only a point at the Stade Pierre Mauroy to clinch a second successive league crown, were comprehensively beaten by the team in second place, with PSG transfer target Nicolas Pepe amongst the scorers on a famous night for Lille.
The result marked a record defeat for the club under their Qatari ownership, which took charge of the club in 2011.
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The champions fell behind after just seven minutes when Thomas Meunier put through his own goal.