Adding to more speculation: reports Sparrow's birth certificate only contains the name "Madden," not "Richie Madden," like Harlow's.
This time last year, Richie hinted to People magazine that an aisle-walk would eventually take place, and it wouldn't be "top secret."
"When we get married, everyone will know," she says. "It will happen when it happens."
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Lawfully wedded or not, the pair, who began dating in 2006, already has the married-with-children routine down.
