Article continues below advertisementBritney Spears wasn't alone this Christmas.The pop star marked the holiday with her youngest son, Jayden James, whom she shares with ex-husband Kevin Federline, a news outlet reported on Friday, December 26.Article continues below advertisementBritney Spears Spent the Holiday With Her Youngest SonSource: @britneyspears/Instagram; MEGABritney Spears spent Christmas with her youngest son, Jayden James.