The couple got engaged back in March, and the "On the Floor" hitmaker confessed her 11-year-old twins Max and Emme love their new blended family with the sportsman's daughters Natasha, 14, and Ella, 11 - and revealed they're keen for the pair to add to the fold.
"I think they would love to have a brother or sister..." the "Hustlers" star told Extra. "They love having Natasha and Ella in their lives and having two extra bonus sisters."
Jennifer, who celebrated her 50th birthday earlier this year while on the road with her "It's My Party" tour, added of her family: "We really form a beautiful blended family and I think they would all be thrilled."
Speaking about his upcoming nuptials during an appearance on "Live with Kelly and Ryan" on Friday (September 27), the baseball legend refused to share details, teasing the couple are just "enjoying the process so much".