The 37-year-old actress is expecting her third child with husband Josh Kelley, 36. The couple wed in 2007 and are parents to two adopted daughters, Nancy, 7, and Adalaide, 4.
In Touch first broke the news of Katherine’s pregnancy back in June.
“She and Josh have been putting off having a baby for career reasons for years, but they felt like the timing was finally right," a source said.
Josh also revealed they are looking to his side of the family for baby names and that he needs “a little extra testosterone” in their house.
Check out which other stars are expecting in the gallery!