Sarah Drew welcomes a son

"She [Sarah Drew] and her husband, Peter Lanfer, are in love with him!" the rep says of the couple's new baby boy.

STORY HIGHLIGHTS

• Sarah Drew delivered son Micah Emmanuel Lanfer on Wednesday


• "I'm about to walk into a chapter of my life where I have no control," Drew said


• Micah Emmanuel Lanfer weighed in at 7 pounds, 4 oz and is 19 inches long

() -- The ... it's a boy for Sarah Drew!

The "Grey's Anatomy" star, 31, delivered son Micah Emmanuel Lanfer at 6:21 p.m. Wednesday, January 18 in Los Angeles, her rep confirms to PEOPLE exclusively.

"She and , Peter Lanfer, are in love with him!" the rep says of the couple's new baby boy, who weighed in at 7 pounds, 4 oz and is 19 inches long.

"I thought it would be a good idea to wait to find out because I am a control freak by nature," Drew explained of their .

"I'm about to walk into a chapter of my life where I have no control over anything anymore, and I figured I'd ease myself into it by not allowing myself to plan for the sex of the baby. It's good training for me!"

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