Article continues below advertisementBritney Spears isn't holding back this holiday season.Article continues below advertisementThe pop star appeared to throw major shade at her estranged family while reflecting on Christmas, which she spent with her son Jayden. Article continues below advertisementOn Thursday, December 25, Spears' younger sister, Jamie Lynn Spears, shared a family snapshot on Instagram featuring her daughters, Maddie and Ivey, alongside her husband, Jamie Watson, and their mother, Lynne Spears, 70.