Gisele Bündchen has penned a heartfelt tribute to her son Benjamin on his 15th birthday ... On a photo of Ben she wrote, "Happy birthday to the sweetest and funniest boy on Earth!" ...

8, the proud parents, who are divorced and co-parent their children, shared birthday tributes for son Benjamin Rein on Instagram to commemorate his 15th birthday ... his son is. "Happy Birthday ...

14, the reality star, 41, celebrated the 15th birthday of his son Mason Dash ... Just kidding love u more than life young blood, happy bday son!” Mason and Reigns' mom also shared a sweet ...