Although Valleywag broke the story today, we had a hint as early as last October that the patter of little mayoral feet wouldn’t be far off. From our interview with SF’s First Lady:

“[Siebel Newsom] got the chance in August to see Clinton speak at the Democratic Convention-where she also had an epiphany while watching Michelle Obama: ‘I was thinking, “This woman inspires me. I love how strong she is; I think she's a very elegant mother. I admire them as a family unit.” And you know what? It made me want to have kids ... it did!’ You heard it here first.”

Congratulations, Mr. and Mrs. Mayor.