The 38-year-old singer has Phoenix, 15, Angel, six, from previous relationships and Madison, two, with current husband Stephen Belafonte, reported OK! magazine.
"I'd like to, but I'm not sure. I always say just one more. I want to have that boy, but knowing my luck I'll have another girl," Mel B said.
The singer, who is a judge on 'America's Got Talent' said she enjoys hanging out with her daughters.
"We love hanging out by the pool and having a barbecue, or we take a walk around Malibu, go to Venice Beach or Santa Monica Pier," she said.