Jamie Lynn Spears' daughter celebrates birthday

Story highlights

  • The child was involved in an ATV accident four months ago
  • A pool party was held over the weekend

(CNN)Four months after a catastrophic accident, Jamie Lynn Spears' daughter has reached a milestone.

Maddie Aldridge turns nine Monday, and the family celebrated over the weekend.
Spears posted pictures from the pool party on social media.
    "Today was the perfect day for a party," she wrote. "Thanks to everyone for coming out, and celebrating with our baby girl

    Today was the PERFECT day for a PARTY💜💛 Thanks to everyone for coming out, and celebrating with our baby girl💜💛

    A post shared by Jamie Lynn Spears (@jamielynnspears) on

    In February, the child was steering an ATV to avoid a ditch when she drove into a pond on the family's property in Louisiana.
    The accident resulted in her being "trapped and secured by the seat belt and the ATV's safety netting," authorities said at the time.
    She was hospitalized for several days after the incident.
    Her famous aunt, singer Britney Spears, thanked fans for their thoughts and prayers at the time.
    Jamie Lynn Spears has posted photos of her daughter since her release from the hospital, including a pic of Maddie visiting her school to deliver treats to her classmates, and another in honor of Father's Day.

    Happy Father's Day to the best dad in whole world❤️❤️We love you❤️❤️

    A post shared by Jamie Lynn Spears (@jamielynnspears) on

    Maddie is the daughter of Spears and her former fiancé, Casey Aldridge.