The 45-year-old actor rushed to the aid of a woman who hurt herself after falling outside his home Saturday in the Brentwood neighborhood of Los Angeles.
In pics from the scene, Naomi Watts' man is seen joining several other do-gooder citizens who stopped to help a woman sitting in the street.
Schreiber, dressed casually in gray shorts and matching T-shirt, bent down to assist the woman and also chatted with the fallen lady while she recovered from the spill.
Meanwhile, Schreiber took to Twitter the same day to share an adorable pic of his fam celebrating St. Patrick's Day. "Happy Saint Patrick's Day!!!" he posted, along with a photo of one of his and Watts' sons dressed as a leprechaun.