Mary McCormack Mary McCormack

In Plain Sight actress Mary McCormack and husband Michael Morris welcomed a baby girl over the weekend, People reports.

"It's a girl!" McCormack tweeted. "She's not named yet."

McCormack, 42, plays U.S. marshal Mary Shannon on the USA drama. After the actress announced her pregnancy, it was written into the show's fourth season.

The new addition joins Rose, 4, and Margaret, 7.