The "My heart will go on" singer took to Instagram on Saturday to wish her eldest son, Rene-Charles Angelil, a happy 19th birthday. Dion posted a baby photo of him and a more recent one of them together, reports etonline.com.
"My dear Rene-Charles, I'm so proud of the way you're conducting yourself in life. You're a true gentleman, and I want you to know that your father's guidance continues to support and protect you as I do," Dion wrote.
"Keep being the best of yourself strong, passionate, and wise, as you pursue all of your dreams in life - the sky's the limit!"
"And above all, have a good time!.... Your happiness, is my happiness," she continued. "I love you so much, my dear son! Mom xx "
Dion is also mother to 9-year-old twins, Eddy and Nelson.
January began with a heartache for the star. Dion's mother, Therese Tanguay-Dion, died on January 16 this year, after months of battling health issues.
The singer paid tribute to her late mother the following day during her show in Miami.
"We got a call from the nurses who were taking care of her so well, saying that her time was coming soon. Very soon," she described.
"So last night, I joined my brothers and sisters in Montreal and I spent the evening at her bedside. We told stories, we sang songs, we hugged each other," said the singer.
( With inputs from IANS )