Tori Spelling announced via Twitter Tuesday she has given birth to her third child, a daughter named Hattie Margaret.

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Spelling and Dean McDermott, her husband of five years, are also the parents of son Liam, 4, and daughter Stella, 3. McDermott also has a 13-year-old son from a previous marriage.

"Our family's so happy to announce that 10/10/11 our baby girl Hattie Margaret McDermott was born at 7:08am! Xoxo," Spelling said in her online posting.