The couple, who have been married since 2013, already share a three-year-old daughter named Story Annabelle Paul.
Announcing the news over Instagram, Lauren wrote: “We can’t wait to meet you baby! We love you so much already.”
The caption was accompanied by a picture of Lauren showing her small baby bump on her story.
Paul has been open about his desire to have more children in the past. In an interview with Haute Living, the Breaking Bad star discussed turning forty and admitted he “couldn’t wait to have another baby”.
“People get stressed out when they get older, but you should be happy that you’re still here. It’s easily the best chapter of my life,” he added. “I think if I maybe was single, didn’t have a job and was struggling and turned 40, it would be a lot harder, but I feel I’m in a good place.”
“I can’t wait to have another baby, and I’m so excited to see what 40 has to offer. I’m just excited to be around, to be alive.”
“I’m just happy to be here. Life is good.”