Bialik's manager, Judy Coppage, confirmed Tuesday's birth. It's the first child for the 29-year-old actress and her husband, Michael Stone, People magazine reported.
No additional details were immediately available.
Bialik starred as Blossom Russo on the hit NBC show, which debuted in 1991. More recently, she has done voiceover work on "Kim Possible: The Secret Files" and "X2: Wolverine's Revenge."