Dolores Hughes, known affectionately as Mema, the unlikely/likely breakout star of the hit show, “Hollywood Hillbillies,” has died … TMZ has learned. The exuberant grandma on the reality show died of heart failure at a hospital in Grayson, Georgia last Wednesday, according to her manager, David Weintraub. “Hollywood Hillbillies,” the #1 show on Reelz at