Jennifer Hudson promised her fiance’ David Otunga another baby after their son turned four [click here if you missed that].

Jen just filed for an extension…

Jenner Hudson tells E News

“I want a little girl so bad. And my son every day, ‘Mommy, I want a baby sister. I want a baby sister.’ David and I originally said when he turned four, but he’s four now so maybe when he turns six because four came a little too soon.”