Britney Spears and her younger sister Jamie Lynn Spears celebrated Jamie's daughter, Maddie, turning 10 on June 19. The former Zoey 101 actress, who welcomed her second child, daughter Ivey Joan in April, shared a snap from the birthday celebration on Instagram. In the family photo, Britney poses next to big brother Bryan and his daughter Sophia, along with her boys, Sean Preston, 12, and Jayden James, 11. Birthday girl Maddie also makes an appearance on the couch holding 2-month-old Ivey, and it's all too adorable. Watch the video Jamie uploaded of Britney and the rest of the Spears brood singing happy birthday to Maddie ahead.