April 17, 2013 03:00 PM

Kevin Winter/Getty

The mystery of why actor Eric Christian Olsen can’t stop smiling these days has been solved.

The NCIS: Los Angeles star and  Sarah Wright are expecting their first child — a boy! — in August, they tell PEOPLE exclusively.

“When they handed me the 3D sonogram and I saw Sarah’s perfect lips and that little Norwegian nose just like mine, I was overcome with a sense of clarity in the world that I can only imagine is beginning of fatherhood,” Olsen, 35, tells PEOPLE.

“We’re so excited and can’t wait to meet him.”
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Olsen and Wright, who guest-stars on Parks and Recreation and Men at Workexchanged vows last June at their family’s ranch near Jackson Hole, Wyo. have been thinking about starting their family for a while now.

“I can’t imagine a better mother for our future children,” Olsen told PEOPLE the day after they wed.

RELATED GALLERY: Inside Eric Christian Olsen’s Wyoming Wedding

— Monica Rizzo

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