Are you talking about Kathryn Erbe? She has a 10 year old daughter and a 4 year old son.
Her pregnancy with the four year old was written into the show. Her character was serving as a surrogate mother for her sister. That's kind of bizarre, but better than a season of file folders and closeups of her face. The character even used the pregnancy to get witnesses and suspects to talk to her.
I started watching L&O:CI when Erbe was pregnant, and I don't think I've seen many of the others. It weirds me when I tune in and Goren has a different partner.
Over in the comedy arena,
My Name is Earl
's Jaime Lee Presley's real-life pregnancy was written in as Joyce surrogating for her half-sister. (If anything, prego-Joyce is even funnier than usual.)
Anyone watching tonight's CSI?
I just finished the most traumatic Ugly Betty ever!
YES! That was awful. The ending about did me in. Well done, but jeez.
I missed the ending of CSI what happened?
It hasn't ended yet. Five more minutes.
Ok. It's over. There was not the death of a CSI. I was promised a shocking death.
It was REALLY creepy, though.
Edit: Oh, nevermind. There's another episode now.
Edit again: This is a re-run. But, I saw a preview. Was this not the season finale?
CSI: Man. You could really tell they had to suddenly redo the last 5-10 minutes.