Robert De Niro’s daughter Drena mourns teen son at gravesite after accidental overdose

Robert De Niro’s adopted daughter, Drena De Niro, is mourning the loss of her son at his resting place — and expressing solidarity with others who are grieving — just months after the 19-year-old died of an accidental overdose in NYC.

The “Star Is Born” actress, 52, took to Instagram Monday to share photos from the gravesite of Leandro De Niro-Rodriguez, as well as her hope “for the whole world to heal.”

“If everyone valued the depth of love and sadness a person can feel, I don’t believe we’d have wars, we wouldn’t hurt children, animals, each other, our planet and oceans the way we do … I’m grieving both for myself, my loved ones and everyone who has ever lost a child or one whom they’ve loved so deeply,” De Niro said.

“I’ll never get used to this, no one should,” she continued. “Praying for the whole world to heal and for this heart that beats inside me to find peace.”

In early July, Robert De Niro’s grandson was found dead in a Financial District apartment, after his mother claimed he was sold “fentanyl-laced pills” that were dupes of oxycodone. His cause of death was confirmed in August to have been a toxic mix of drugs, including fentanyl, bromazolam, alprazolam, 7-aminoclonazepam, ketamine and cocaine.

Sophia Marks, 20, was arrested less than two weeks later for allegedly selling the drugs that led to Leandro’s overdose. She was charged with three counts of narcotics distribution, each of which carry 20 years behind bars.

According to a criminal complaint obtained by the Daily News, Marks also sold the fentanyl-laced pills to an undercover cop prior to her arrest.

“[P]lease be careful with these. [D]on’t do more than one at a time … my friend just died,” Marks allegedly told the officer, referring to a different 19-year-old who died the previous month.