Cameramen rushed to the scene as the actress fell to the ground on the New York set, possibly from exhaustion.
Last week, images emerged of the mother of four looking painfully thin and gaunt, and sources close to the star voiced their concerns.
“Everyone is very worried about Nicole,” a source tells New Idea.
“She’s been pushing herself so hard recently – working so much with back-to-back movies, TV series, and never takes a break in between.
“It’s obvious that she’s lost weight recently and with her hectic schedule, it’s no surprise that it all became too much for her and she collapsed on set,” they continue. “It was very dramatic and only lasted a few seconds, but obviously everyone was very concerned.”
The actress is currently juggling work on the HBO series The Undoing and the premieres of two upcoming movies, The Goldfinch and Fair and Balanced.