Friends say the 34-year-old reality star has come to the realisation that she and the couple's children - Mason, four, and 20-month-old Penelope - are all Scott has following the tragic passing of both of his parents in recent months.
Scott, 30, lost his beloved mother, Bonnie, 63, after a long battle with illness on October 28, followed less than three months later by his father, Jeffrey, also 63, on January 3.
According to Life & Style, the couple are reportedly eyeing up close friend Joe Francis' luxury five-star property in picturesque Punta Mita, Mexico - where they vacationed as a family in January - for their low-key destination nuptials.
Kourtney, who is the oldest of the Kardashian, has repeatedly turned down Scott's marriage proposals in the past. Reports say, they are likely to have their wedding before Kim and Kanye's May 24th wedding day.