It's been a summer of major life milestones for Lauren Sanchez Bezos, who began the season by tying the knot with billionaire Jeff Bezos —and she is closing it out by bidding farewell to her son, Evan Whitesell, who has left the family home to start his freshman year at college.

"18 years of early mornings, late night snacks and family dinners...," the mother of three wrote as she dropped her son Evan off at college