One day earlier, 71-year-old Stallone shared a side by side pic on Instagram of the two stars at their buffest back in the day, adding the caption "Pre - HAPPY BIRTHDAY ARNOLD!!!! As long as you live and beyond, you're always going to be the "BIG MAN " who set the bar so high that it will never be surpassed, an action hero legend!"
Backstage at the Golden Globes, Stallone told ET of their occasionally contentious friendship, "You know, he's become such a close friend. We were so adversarial. It was like Frazier/Ali, and he's become such a gentleman."
For more on his win and their epic friendship, watch the video below!