Nicole Richie Got Secretly Married With Joel Madden!?

Joel Madden and Nicole Richie

Something doesn't match about Nicole Richie's 5-week-old son's name! In his birth certificate the baby's full name is Sparrow James Midnight Madden. We know that parents Nicole Richie and Joel Madden are not married, but despite that, their daughter Harlow's last name is Richie Madden. So why little Sparrow James Midnight’s last name isn't also Richie Madden? Can somebody answer to this question?
Or should we guess? According to RadarOnline, the couple are rumoured to have secretly tied the knot in an intimate service on Wednesday 14th October after obtaining a marriage licence last week. So if Nicole Richie becomes Nicole Madden, then their child can be named after his father's name. Yes, this should be the answer!