An ATV accident in Kentwood has seriously injured the 8-year-old niece of Britney Spears, according to TMZ.Jamie Lynn Spears' daughter, Maddie was on an off-road vehicle Sunday night when it flipped over into and landed in nearby water.The young girl was airlifted to a nearby hospital where she is listed in serious condition.A spokesperson for the Archdiocese of Baton Rouge says students at a Hammond school are praying for the Maddie Spears.Dr. Linda Verges says administrators at Holy Ghost School in Hammond are trying to be as calm as possible in the wake of reports of her Sunday accident near Amite.Spears is a student at the school.