Britney Spears’ fans have a new title for her: “Queen of shading your sister.” On October 12th the singer posted a photo of herself on Instagram and her caption has many believing she was throwing shade at her little sister Jamie Lynn Spears. The 24-year-old “Zoey 101” actress released her memoir, “Things I Should Have Said” yesterday but as noted by Page Six, she originally wanted it to be “I Must Confess,” a lyric from Britney’s 1998 debut single, “…Baby One More Time.“ However, Britney’s fans