The 32-year-old 'Toxic' hitmaker, who is nine years older than her sibling Jamie Lynn, is her biggest fan, reported Contactmusic.
"There's such a big age difference between me and my sister that I think (she) almost was like a second mom. She's so supportive and she's so encouraging of me and she's like my biggest fan... She's always had my back," Lynn said.
The former Nickelodeon star has a 'special' bond with her older sister and has always been inspired by her dedication to her career, which began when Spears was just 11-year-old.