It’ll Be a Boy for Tiffani Thiessen

01/21/2015 at 04:00 PM ET

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.

Tiffani Thiessen pregnant expecting second son
Elizabeth Messina

— Anya Leon with reporting by Jennifer Garcia

RELATED GALLERY: The Celebrity Guide to Sharing Your Baby News

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Callie on

That is one beautiful family. Their little girl is just gorgeous! Very happy for them🙂

ELC on

Congrats….that’s wonderful news for the family. What a beautiful

Catherine on

How exciting!! Their little girl is adorable and I love the name Harper.

sommerle07 on

LOL Harper looks thah-rilled in this picture.

lynnie on

Very cute family. Their son will be gorgeous as well. Congrats!

klutzy_girl on

Adorable family! Excited to see what name they choose this time around.

Sara on

Beautiful little girl. Congrats on your little boy :)!

mommytoane on

Harper does not look “Thrilled” in the pic at all.

Sad part is that by the time the baby is born, Harper will be 5. By the time the baby will be able to interact with her beyond giggles she will be 6, and by the time he’s able to fully play with her she will be 7. By 7 she will be in school, have her own friends, playmates and won’t be so into a sibling. Lets just hope there is that perfect sibling relationship Tiffani is hoping for.

krissy on

You do know that in the 90210 clip that is not Tiffani, right??

Anna on

Adorable! Congrats to the happy family.

Jay on

I love her and am so happy that they are having a boy!! Best wishes. Can’t wait to see what name they choose.

LAcanyonmom on

mommytoane: You sound RIDICULOUS. stop giving people timelines of their children’s lives and making bizarre assumptions of how, when and where they’ll play together. I have a sibling 2 years older than I am, we never played together b/c we just were too different. My kids are 6 years apart and adore each other. They each have friends to play with and each other to love. You don’t have children close together just to provide a playmate. Worry about your own kid and keep your ignorant mouth closed.

traceylee215 on

Such a beautiful family! Congratulations to Tiffani Thiessen and Brady Smith!

You may not be aware, but the clip you provided above features Gabrielle Carteris, who played Andrea Zuckerman on the original 90210, and not Tiffani Thiessen.

Danielle on

Thank you for this. Could not agree with you more. You will never know what happens with getting pregnant again, and you can be 1 year apart or 10 and like or dislike each other.

Toni on

Great news!! Is her character on White Collar welcoming a boy too?

Kale on

Love the name Harper! Can’t wait to see the name of the new addition.