Rich Dollaz -- Arrested During Illegal Burger Run

"Love and Hip Hop" star Rich Dollaz just bought the most expensive burger of his life ... it cost him thousands of dollars and his freedom.

Here's what we know. Dollaz and his pals double parked outside the Edgewater, New Jersey police HQ Sunday night ... so they could make a quick burger run to a nearby Five Guys. Cops went over to write Dollaz up when they ran his plates and discovered there was a warrant for his arrest.

Turns out ... the 43-year-old music exec owes $11K in child support ... so cops busted him burger in hand.

Dollaz was hauled off to Hudson County jail ... where he's still in custody.