John Legend and Chrissy Teigen like to keep things “hot” in their marriage. The 45-year-old singer has been married to model Chrissy, 38, since 2013 and has Luna seven, Miles, five, Esti, 12 months as well seven-month-old Wren – both of whom they welcomed via surrogate – with her but an insider has now claimed that even a decade after tying the knot, the celebrity duo still make sure they have romantic time together. The source told UsWeekly: “Keeping their relationship hot is a priority. They schedule date nights and love to dine out or go to a trendy bar. Chrissy feels so lucky to have a hus…