Tiffani Thiessen has announced that she is expecting a second child with husband Brady Smith.

The actress, who starred in Saved by the Bell and Beverly Hills, 90210, announced the news via Instagram on Friday (January 16).

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She accompanied the photo with the caption: "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 welcomed her first child Harper Renn back in 2010.

TV movie The Unauthorised Story of Saved by the Bell aired on Lifetime last year.

It saw new actors playing the old cast members, with Alyssa Lynch as Thiessen, Julian Works as Mario Lopez and Tiera Skovbye as Elizabeth Berkley.