Amy Graves/WireImage
Sarah Michaud and Diane Herbst
April 26, 2011 04:00 PM

It’s a girl for Ian Ziering!

The actor’s wife Erin delivered daughter Mia Loren Ziering at 10:09 p.m. Monday in Los Angeles, PEOPLE confirms. Weighing in at 7 lbs., 6 oz., the baby girl’s name begins with ‘M’ in honor of Ian’s late mother Micki, a source tells PEOPLE.

“Well, it’s official, I’m a dad!,” the former Beverly Hills, 90210 star, 47, wrote on his Facebook page.

“As I sit holding Mia, Erin sleeps the most beautiful sleep. My thoughts race with visions of a brighter future, only made possible by what happens today… or, last night! God bless us all.”

PHOTOS: 2011: The Year of the Baby

The couple, who wed in May 2010, announced the pregnancy in October and celebrated with a baby shower last month.

And, now that Ziering is a proud father, he says, “more than ever am I worried about the mess in this world. Please, all the bulls— has to stop. I can’t stand what the oil and coal companies are doing to us and what they are going to be doing to Mia. Hey oil and coal companies, I have four words for you, Hydrogen, Electricity, Natural Gas. Reinvent yourselves. For the sake of all of our kids.”

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