Marvin Gaye's Son: My Baby Mama Wants Some of My 'Blurred Lines' Money!

Marvin Gaye III's cut of that $7.4 million judgment from the "Blurred Lines" case might be a little light ... thanks to his baby mama.

According to court docs, Gaye III owes Deanna Holly $62,564.44 in back child support ... and L.A. county stepped in to file a lien against that "Blurred Lines" judgment. The move ensures that when Marvin's checks start coming in, he'll have to fork over the owed dough to Holly.

Back in March, a jury ruled the mega hit "Blurred Lines" infringed on the copyright of Marvin Gaye's classic "Got to Give It Up."

The $7.4 mil will be split among several Gaye kids and others, but now we know where some of Marvin's cash is going.