January 21, 2015 04:00 PM

Life is sweet for Tiffani Thiessen: she’s having a boy!

The actress and husband Brady Smith are expecting their second child and recently discovered they will be welcoming a son, they confirm to PEOPLE exclusively, sharing a photo.

Getting a bit of help from big sister-to-be Harper Renn, the couple cut into a gender reveal cake and were all smiles when they saw the blue slice.

On Thursday, the Dinner at Tiffani’s star, 40, and Smith, an actor, revealed they were expecting a new addition and were looking forward to giving their 4½-year-old daughter a sibling.

“We could not be more excited about extending our family. Harper is beyond thrilled to have a playmate!” they told PEOPLE.

Elizabeth Messina

— Anya Leon with reporting by Jennifer Garcia

RELATED GALLERY: The Celebrity Guide to Sharing Your Baby News

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