The "Party of Five" alum and husband
The little one is due later this year; no word yet on how far along the actress is in her pregnancy.
The costars of "The Client List," 35 and 36, respectively, are already parents to 13-month-old daughter Autumn James.
Hewitt and the "Revenge" actor got hitched just five days before Autumn's arrival in November 2013.
"It was just the two of us and then we went to Bed, Bath and Beyond because that's what married people do," Hewitt told Ellen DeGeneres of the nuptials back in April. "It was really sweet and he's an awesome, incredible father and a great husband and I just feel really lucky. Yeah, it's awesome."
Us Weekly was first to report the baby news.