Russell Wilson is so desperate to have more children with Ciara ... he actually got down on one knee this week and begged his wife on national television for "at least" one more baby.
The NFL star joined the singer while she was hosting "The Ellen Degeneres Show" on Thursday -- and just seconds into the appearance, he pleaded with her to give him more kids.
"Serious question," the 33-year-old said to Ciara. "Can we have more babies?"
"It would be perfect!" he continued. "Just give me one more at least.