The `Samantha Who?` star is expecting her first child with her musician fiance Martyn Lenoble and the couple are said to be "thrilled" with the news.
Christina`s representative confirmed she is expecting to People magazine. No other details are known at the time of writing.
The 38-year-old actress and bass player Martyn, 41, got engaged on Valentine`s Day (14.02.10) after dating for two years, but are yet to set a date for the big day.
Earlier this year, Christina admitted she was keen to start a family with Martyn.
She said: "What`s next? Babies, lots of babies. Well, not lots of babies, but a couple."
The TV star has also previously praised Martyn for helping her overcome breast cancer in 2008.
Christina - who had to undergo a double mastectomy after being diagnosed with the disease - said: "I have a small but mighty support system and Martyn has really been an incredible part of my life. "Without him, I don`t know if I could`ve gone through any of it. He came around at a time when there was a lot of loss in my life on many levels, so he`s been a really incredible help."