The couple, who married on Oct 17 this year in California, have a nine-month-old daughter, Lincoln, together.
"I would love to give her a sibling. I had two older sisters and I think the relationship between siblings is so special," okmagazine.com quoted Bell as saying.
"You are able to share that, 'We are all in this together,' feeling. Because growing up is, like, the worst. Your body hurts and you can't communicate with anyone. You think you know stuff before you know it, and your parents are idiots, and they are embarrassing," said the 33-year-old.
Lincoln is starting to grow into her own features and Bell says the tot has inherited the best features of her mother and her father Shepard.
"She looks almost identical to both of us. She thankfully got all the good features of both of us. She is not spazzy (sic) like me. She is not aggressive. She has got both of our gentle sides," she said.