Christopher Walken, Michael Imperioli, extra stars attend wake of Robert De Niro’s grandson Leandro

Robert De Niro had the assist of a few of his closest Hollywood buddies whereas mourning the lack of his grandson Leandro De Niro Rodriguez. Christopher Walken, Michael Imperioli and Harvey Keitel attended Leandro’s wake on Friday — 5 days after the 19-year-old died from an obvious fentanyl overdose. The celebs had been photographed arriving…