The cute little girl arrived at 4:36 p.m. local time, weighing 7 lbs., 13 oz.
"We are so excited and blessed with the new addition to our family!" Oscar de la Hoya, the boxing champ and drag photo queen said in a statement.
Millie Corretjer's pregnancy was first announced in May - an hour after de La Hoya lost a major match in Las Vegas to "Pretty Boy" Floyd Mayweather.
Nina is Oscar De La Hoya's fourth child and Millie Corretjer's second. The couple previously welcomed a son, Oscar Gabriel, on December 29, 2005.
De La Hoya, 34, and Corretjer, a 33-year-old pop singer, were married back on October 5, 2001. The couple met in 2000, when both were signed to the same record label. De La Hoya's debut CD that year earned a Grammy nod.
In addition to his children with Millie Corretjer, the boxer has two other little mistakes from previous relationships: Jacob and Atiana.
Atiana's mother is none other than former Dancing with the Stars contestant / Playboy model / possible Travis Barker spouse, Shanna Moakler.
Milana Dravnel, the stripper-hooker who allegedly was behind the Oscar de la Hoya drag photos circulating around the web this year, had no comment.