Jennifer Lopez and Alex Rodriguez won't have a problem borrowing a cup of sugar from their new Star Island neighbors, because folks there are welcoming them with open arms ... and happy bank accounts.
We broke the story ... the power couple just scooped up a $40 million waterfront estate on Miami's super-exclusive island 'hood, and our sources there say the locals might be more excited about it than J Lo and A-Rod.
We're told current Star Island residents believe J-Rod's arrival will bring back the lure, luster and celeb status the area's been lacking lately .