Britney Spears' little sister celebrated turning 20 on Monday (04Apr11) by posting a sweet photo of herself and three-year-old daughter Maddie on
Jamie Lynn Spears started her day in style when her daughter's pre-school class sang Happy Birthday to her.
In her Twitter post, she wrote, "Goodbye teens.., Hello 20's!!! Just got serenaded by Maddie's preschool class - no present will top that!!!"