Britney Spears' younger sister Jamie Lynn Spears was feeling reflective over the weekend as she marked a new milestone in her daughter's life.MORE: Britney Spears' teenage sons are seen in incredibly rare photoTaking to Instagram, the actress shared a series of photos of her oldest daughter Maddie dressed up for her homecoming dance.The teenager wore a neon yellow design for the special occasion and was pictured with many members of her family, including Britney and Jamie Lynn's mom Lynn.VIDEO: