Former E.R. star Julianna Margulies quietly married lawyer Keith Lieberthal in Massachusetts last weekend, her rep confirms.

Margulies, 41, who is about seven months pregnant, wore a white Narciso Rodriguez gown and Lieberthal wore a black Armani suit at their Nov. 10 wedding in Lenox, Mass.

“It was all traditional. It was very touching. She was radiant. It was beautiful,” her father, Paul Margulies, who walked her down the aisle, tells PEOPLE. “We’re thrilled for her, and the young man she married is a wonderful person. We’re proud to have him as a part of our family.”

The baby, due in mid-January, will be the first for the couple. The actress recently told PEOPLE at a premiere she’s “doing great.”

Margulies and her new husband had no time for a honeymoon, her father says. They flew back to California, where Julianna is working on her new TV series, “Canterbury’s Law.

“They’re both very busy,” her father says.

Julianna Margulies is to become a first-time mom after confirming she’s pregnant. The 41-year-old actress and fiancé Keith Lieberthal are expecting their first child next year.