Tiffani Thiessen Pregnant With Second Child

"We are excited to announce the news that we are expecting," she said.

ByABC News
January 16, 2015, 9:56 AM
Tiffani Thiessen attends the Rachel Zoe and Molly Sims Host Ovarian Cancer Research Fund's Inaugural Super Saturday LA in this May 17, 2014, file photo in Santa Monica, Calif.
Tiffani Thiessen attends the Rachel Zoe and Molly Sims Host Ovarian Cancer Research Fund's Inaugural Super Saturday LA in this May 17, 2014, file photo in Santa Monica, Calif.
JB Lacroix/WireImage/Getty Images

— -- "White Collar" star Tiffani Thiessen is pregnant with baby No. 2.

Thiessen and her husband Brady Smith are already parents to daughter Harper, 4.

"We are excited to announce the news that we are expecting," the actress, 40, wrote on Instagram. "Harper could not be more thrilled to have a sibling and a playmate."