De Jong, the joint second highest scorer in the league this season, took his goal tally to 13 to lead his side to a 4-2 victory at AZ Alkmaar.
He netted after three minutes before adding a header five minutes later.
Fourth-placed AZ pulled one back through Markus Henriksen before halftime and Robert Muehren made it 2-2 three minutes into the second half. Ten minutes later Georginio Wijnaldum put PSV back in front before De Jong added a fourth.
PSV now have 61 points from 23 matches. Second-placed Ajax Amsterdam play their game in hand at home to Twente Enschede on Sunday.
(Reporting by Mark Gleeson, editing by Tony Jimenez)
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