Pregnant Tiffani Thiessen and her husband Brady Smith are expecting their second child together -- find out if it's a boy or girl! Credit: Angela Weiss/Getty Images

Will they name their tot Zack? Pregnant Tiffani Thiessen and her actor husband Brady Smith are expecting a baby boy together, her rep confirms to Us Weekly.

The Saved by the Bell alum, 40, revealed earlier this week that the couple are expecting baby No. 2. "We are excited to announce the news that we are expecting," she captioned an Instagram pic of their 4-year-old daughter. "Harper could not be more thrilled to have a sibling and a playmate."

Thiessen and Smith, 43, married in 2005 and welcomed their little girl in June 2010. (She told Us in 2011 that she fell in love with her hubby after he performed an invisible hula hoop dance!)

While attending the 4th Annual Santa's Secret Workshop event in West Hollywood last month, the White Collar actress gushed about wanting to expand her family. "A brother or a sister for Harper! We will take either as long as it's happy and healthy," she told Us on Dec. 6. "[Harper asks] on a daily basis."

As for Harper's latest milestones? "It's amazing how fast they grow. Just intellectually too!" she said. "It's pretty amazing — the conversations and the things that are coming into her brain. [She's] extremely independent."