Whenever fans see photos of Reese Witherspoon and Ryan Phillippe's adult children, 24-year-old Ava and 20-year-old Deacon, they're bewildered by just how much the siblings look like their parents.

The Cast of I Know What You Did Last Summer: Where Are They Now? Reese Witherspoon's Son Deacon Phillippe in Talks to Star in Movie with Liam Neeson All About Deacon Phillippe, Reese Witherspoon ...