March 16, 2013 01:00 PM

Maggie Rizer is a model mama again!

She and husband Alexander Mehran welcomed their second child, son Quinnlann Clancy Mehran, on Friday, March 15 outside of San Francisco, Calif., Rizer tells PEOPLE.

Arriving a week ahead of schedule at 5:19 p.m., Quinn weighed in at 7 lbs., 12 oz. and is 20 inches long.

He joins big brother Zander, 15 months, at home.

“We are so proud to introduce our son,” the model, 35, tells PEOPLE, sharing a photo on her Instagram.

“Quinn is absolutely perfect and our hearts are filled with love. We feel incredibly blessed to have been given another little angel. Our cup runneth over.”

Courtesy Rizer-Mehran Family

The couple, who married in 2010, announced in October that they’d be adding a second son to the family.

During the course of the pregnancy, Rizer and Mehran lost their beloved golden retriever Bea in an airline mishap that was heavily covered in the press.

— Sarah Michaud with reporting by Charlotte Triggs

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