Actress Jodi Sta. Maria marked a major family milestone on Tuesday, sharing a nostalgic open letter to her son Thirdy Lacson in honor of his 20th birthday . In a heartfelt Instagram post, Jodi reflects on the passage of time. She expressed her disbelief at how quickly the years have flown, recalling the days when she held him as a "small and fragile" infant. Now that Thirdy is officially an adult, Jodi looks back on his growth and describes him as a divine blessing she is eternally thankful for. Read more of Jodi Sta Maria's birthday message to her son, Thirdy Lacson in this gallery.