- Photo: Sara De Boer/Retna Ltd.1 of 8
- Photo: Splash News2 of 8
- Photo: London Entertainment/Splash News3 of 8
- Photo: Fame Pictures4 of 8
- Photo: Cleyton Vitalino/Splash News5 of 8
- Photo: X176 of 8
- Photo: Jeff Vespa/WireImage.com7 of 8
That rumor comes courtesy of Radar Online, which claims the couple, who are also parents to button-cute 21-month-old daughter Harlow, got a marriage license last week and said "I do" in a "top secret ceremony" on Wednesday.
Nicole's rep didn't respond to our request for comment on the knot-tying rumblings, but an insider tells Radar that the former party girl-turned-hands-on mom has been "talking more seriously" about making things legal since the August death of her onetime fiancé, Adam "DJ AM" Goldstein.
Adding to the speculation: TMZ 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."
Lawfully wedded or not, the pair, who began dating in 2006, already has the married-with-children routine down.
"[Joel] has lost his hearing. Been asking 4 help round the house for 3 hours," Nicole tweeted on Thursday. "Wait, just said baseball & he's back! ITS A MIRACLE!"
Read more Hot Gossip
'Full House' 2
Get all the scoop on who's in and who's out for Netflix's "Fuller House," on Replay hosted by Wonderwall's Kirby Kristen.Watch Video »
Check out everything you need to know about Brooklyn Beckham from Instagram on today's Celebs Gone Social.Watch Video »
Shailene Woodley and the stars of "Divergent" chat phobias and on-set injuries at the film's world premiere.Watch Video »
Blake Lively chats motherhood, HGTV and rocking an amazing wardrobe in "The Age of Adaline" on Wonderwall.Watch Video »
Taylor Swift and her brother celebrate Easter with an epic egg hunt on today's Celebs Gone Social.Watch Video »
DIY Celeb Makeup
We show you how to get Taylor Swift's blue eye shadow look on "DIY Celeb Makeup."Watch Video »
From Crowd Ignite