October 04, 2012 02:00 PM

Courtesy Carly Smithson; Inset: Alberto E. Rodriguez

It’s a girl for Carly Smithson!

The American Idol season seven finalist, 29, and husband Todd welcomed their first child, Olivia Mabel Smithson, on Sunday, Sept. 30 at 10:55 p.m., the singer announced via Twitter.

“I’d like to introduce you all to my new baby,” Smithson wrote, sharing a photo of her daughter.

Post-Idol, the Irish singer teamed up with former members of Evanescence to form We Are the Fallen — and says she’s fine with being the only girl in the band.

“I’m used to it,” Smithson tells PEOPLE. “My husband, Todd, and I own a tattoo shop, and there are all these big, tattooed dudes who make fun of my accent. It’s the same with these guys, except they play instruments.”

Courtesy Carly Smithson

— Sarah Michaud

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