The mother of slain Bronx teen Lesandro “Junior” Guzman-Feliz was accosted by a supporter of her son’s accused killers, who shouted obscenities at her outside court Tuesday.

Leandra Guzman was leaving the murder trial for five gangbangers accused of hacking her 15-year-old son to death outside a Bronx bodega last summer when she was confronted by a pregnant woman screaming at her in Spanish, witnesses said.

“Leandra was calmly walking down the hallway getting ready to go home, said absolutely nothing to them, minding her peace … and out of nowhere, the pregnant one started screaming at her — ranting, raving, carrying on and yelling at her,” one witness said.

Guzman responded with an expletive in Spanish.

“Leandra acted like a mama bear,” the witness said.

The grieving mother had to be led off by court security following the tense altercation.