Mark Estes insists he and Kristin Cavallari are “going with their flow” and confirmed they have discussed having a child together. The 37-year-old reality star – who was previously married to retired bodybuilder Jay Cutler from 2013 until 2022, and has Camden, 11, Jaxon, nine, and eight-year-old Saylor with him – revealed her relationship with TikToker Mark, 24, earlier this year, and recently said she was “mulling over” the idea of starting a family with him as he’s keen to have his own children. And speaking to ‘Entertainment Tonight’ at the CMT Music Awards at the Moody Center in Austin, Te…