Kirstie Alley Welcomes Grandson Waylon Tripp Parker -- See the Sweet Pic!

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Kirstie Alley is a grandmother!

The 65-year-old actress announced on Tuesday that her son, William True Stevenson, recently became the father of a bouncing baby boy.

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"When your son has a son ... bliss ... yes this is my secret happy news as promised," Alley tweeted. "Welcome Waylon Tripp Parker."

Alley posted a photo with the tweet, featuring William, 23, resting with Waylon on his bare chest.

William is Alley's adopted son with ex-husband, Parker Stevenson. The former couple made William a part of their family in 1992 and adopted daughter Lillie, 22, in 1994.