PSG's win was effectively sealed halfway through the first half as Dembele opened the scoring on 19 minutes before Mbappe netted with a clever flick just three minutes later.

Mbappe found Dembele for his second of the game, producing sublime skill by nutmegging Nathaniel Adjei and crossing into the box before doubling his own tally in stoppage time.

The France captain's strikes made him the first French player to reach the 25-goal mark in four consecutive seasons in one of Europe's top five leagues.

Lorient's consolation came as Bamba Dieng headed in Benjamin Mendy's pinpoint cross midway through the second half.

PSG could have finished the day with the title assured, but Monaco's win in the later fixture delayed their celebrations. They can instead win Ligue 1 for a 12th time on Saturday, in front of their home fans against Le Havre.