Ming-Na has traded the ER for the maternity ward.
The former TV doc gave birth to son Cooper Dominic Wednesday. He made his debut at 2:33 p.m. at St. John's Hospital in Santa Monica, tipping the scales at 8 pounds, 9 ounces, according to People.
"Mother and baby are doing great," Ming-Na's husband, screenwriter Eric Zee, told the magazine.
Cooper is the second child for the couple, who married in 2005. He joins his 4-year-old sister, Michaela.
Ming-Na, 41, first infiltrated America's living rooms as Dr. Jing-Mei "Deb" Chen on NBC's long-running hit ER. Her four-year on-off tenure at County General finally came to a close in 2004.
"I think it was a mutual decision," she told TV Guide at the time. "The producers definitely talked about running out of stuff to do with the character. I felt like it's been that way for the past year; I wondered if there's anything left. We both decided it's time to finish the character."
But she made a quick return, starring in this fall's fittingly titled NBC drama Inconceivable alongside fellow network vet Angie Harmon. The show centers around life at a fertility clinic.
Shortly after being cast, the actress learned she was pregnant.
"I threw them a curveball," she told People last month. "You know, I'm such a Method actor!"
Ming-Na might have some extended maternity time, though. Inconceivable has already been pulled from the net's Friday night lineup due to poor ratings and replaced with reruns of Law & Order: Criminal Intent.
While NBC claims it has only temporarily halted production on the drama, Variety reported earlier this month that the show has been canceled.