Production in a major new movie, starring Oscar winners Reese Witherspoon and Jack Nicholson, was held up for a day after an actress in the film — currently called ‘Untitled James L. Brooks Project’ — unexpectedly went into labor prematurely at her hotel, and had to be rushed to the hospital, RadarOnline.com has learned exclusively.

Actress Kathryn Hahn (Crossing Jordan) — who plays a pregnant secretary in the film — is pregnant in real life. She went into labor after her water broke during filming Saturday.

On Monday morning, after a grueling two days of labor, Hahn reaped the fruits of her labor: Mae, a 5-pound girl.

Though her due date was originally projected as September, the unexpected birth doesn’t throw a monkey wrench into the plans of the film’s producers, who expected Hahn to give birth after filming wrapped — the actress had only one day left to film, and will finish the rest of her scenes when she has recovered.

The film also stars Paul Rudd and Owen Wilson.

From Radar Online