Just look at that expression!

Tiffani Thiessen took to Instagram on Sunday, May 1 to share a sweet new photo of her baby son Holt — and the pic is almost too cute for words!

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10 months old #timeflies

A post shared by Tiffani Thiessen (@tiffanithiessen) on

"10 months old #TimeFlies," the Saved by the Bell star, 42, captioned the sweet snapshot of Holt adorably posing for the camera while in a swing.

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Tiffani and her husband, Brady Smith, 44, previously welcomed Holt in July 2015. The couple — who married in July 2005 — are also parents to daughter Harper, 5.

Click through the gallery below to see more cute celebrity babies!