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“Our family’s so happy 2 announce that 10/10/11 R baby girl Hattie Margaret McDermott was born at 7:08am!” Tori Tweeted on Tuesday morning.

(See a glimpse of baby Hattie, HERE!)

Back in April, the couple stopped by Access Hollywood Live, where the reality star said the couple’s two little ones, Liam, 4, and Stella, 3, were still getting used to the idea of a new addition to the family.

“Liam kind of knew. Liam kept saying, ' Mama, your belly is getting huge. There’s a baby in there!’ For a while, I was like, ‘No, no, no, there’s nothing in there. Maybe I put on a little weight.’ And he’d be like, ‘No, there’s a baby in there, there’s a baby in that belly.’ I said, ‘Why?’ He said, ‘Because, I wished for it.’” she told Billy and Kit at the time. “Stella, she’s not that into it. I tell her, ‘Look at my belly,’ she says, ‘Yeah, I came out of that belly!’ So, I think it’s going to be a little harder for her.”

Dean also has a 13-year old son, Jack, from a previous marriage. Tori and Dean tied the knot in Fiji on May 7, 2006 after getting engaged in December 2005.