"My baby is 9 years old today, and more than ever we realize how precious every day is. So, we have to thank these 2 HEROES. John and Victoria are the first responders, who literally saved Maddie's life, and they were able to celebrate her another year of her life with us this past weekend!" the 26-year-old singer wrote. "Thank God for these amazing people, and thank you God for your amazing grace."