Jamie Lynn Spears' Daughter Maddie Celebrates 9th Birthday 4 Months After Scary ATV Accident

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Jamie Lynn Spears' daughter, Maddie
, is turning nine on Monday, and the proud mom celebrated her little girl's birthday over the weekend with a fun party and lots of decorations.

The 26-year-old singer and actress took to Twitter on Saturday to share some snapshots of the festive pool party, including a super sweet photo of the birthday girl standing in front of some of the cute and colorful signage, and a group pic in front of Maddie's LSU-themed purple and yellow birthday cake.

WATCH: Jamie Lynn Spears Poses With Daughter Maddie and Mom Lynn in Selfie Following ATV Accident

"Today was the PERFECT day for a PARTY," Spears captioned the pic. "Thanks to everyone for coming out, and celebrating with our baby girl."

Spears also shared more photos of the massive, festive setup, including a "Happy Birthday" sign in the bushes, along with a slew of stars and cute balloons next to the pool.

WATCH: Jamie Lynn Spears' Daughter Happily Holds a Baby Alligator Just Months After ATV Accident

On Sunday, Spears also celebrated Father's Day with an adorable photo of her husband, Jamie Watson, holding hands with Maddie as they walked through a crosswalk.

"Happy Father's Day to the best dad in whole world," Spears wrote in the caption. " We love you."

WATCH: Happy Father's Day to These First-Time Celebrity Dads!

Spears and her ex-fiancé, Casey Aldridge, welcomed Maddie in June 2008 before the pair subsequently split up. She and Watson got engaged in 2013 and tied the knot in New Orleans in March 2014.

This birthday and Father's Day are particularly special for Spears and Watson after their daughter was hospitalized in February following a terrifying ATV accident, in which she was submerged in a pond on the family's property for two minutes.

Maddie made a full recovery in the following weeks, but her mom has been very vocal about the lessons the frightening ordeal taught her about life. Check out the video below to hear more from Spears about her daughter's amazing recovery.

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