Tiffani Thiessen expecting second baby!

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Tiffani Thiessen and her husband, actor Brady Smith, are expecting their second baby!

The couple, and their 4-year-old daughter Harper, took to Instagram on Thursday to share the news.

PHOTOS: Stars Share Pics of Their Cute Kids

Thiessen, Smith and their daughter posed outside for a heartwarming family photo, which the 40-year-old actress captioned, "We are excited to announce the news that we are expecting. Harper could not be more thrilled to have a sibling and a playmate."

Thiessen and Smith, 43, tied the knot in July 2005, and welcomed Harper in June 2010.

Congrats to the happy family!

NEWS: Maternity Couture: The Best-Dressed Bumps of 2014!

The year has just begun but 2015 has already had its share of baby news, but let's relive some of last year's biggest pregnancy announcements ever! Check out the video below for a look at some of the coolest ways stars let the world know that they were expecting in 2014.

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