The two-time Oscar-nominated actress kept it casual in white pants and a striped top for her meal at Cafe M.
The sighting comes days after the actress made headlines for revealing that late actor Robin Williams put her through college with his Juilliard scholarship.
Chastain will next star opposite James MacAvoy in Ned Benson's love story The Disappearance of Eleanor Rigby. The film unveiled its international trailer on August 12 and is set to be released in three parts, Them, Him and Her, before the end of the year. Them will hit theaters September 26.