Tiffani Thiessen Pregnant With Baby No. 2!

"We are excited to announce the news that we are expecting. Harper could not be more thrilled to have a sibling and a playmate," actress writes on Instagram

Tiffani Thiessen's family is going to have another adorable addition!

The actress has revealed that she's pregnant with her second child through a sweet Instagram post.

Thiessen shared a professional photograph of her beautiful little girl Harper sitting between mom and dad Brady Smith and captioned the pic, "We are excited to announce the news that we are expecting. Harper could not be more thrilled to have a sibling and a playmate. Photo by @elizabethmessina."

During a recent interview with E! News, the former Saved by the Bell star revealed that she and her hubby are "working on" having another baby, and also spilled on who was giving her the most pressure about getting pregnant (and it's not who you might expect).

We are excited to announce the news that we are expecting. Harper could not be more thrilled to have a sibling and a playmate. Photo by @elizabethmessina

A photo posted by Tiffani Thiessen (@tathiessen) on Jan 15, 2015 at 5:15pm PST

"My daughter is more pressure than anybody else that I ever get. She wants a sibling so badly," revealed the White Collar star, whose hit USA show signed off after six seasons, talking about her 4 1/2-year-old girl.

"We could not be more excited about extending our family," the couple tell People magazine, who first broke the news of their bun in the oven. "Harper is beyond thrilled to have a playmate!"

Thiessen adds, "There's nothing baby about [Harper] anymore—which is hard! It's sad at the same time, because the baby stage is definitely over."

Congratulations to the growing family!