(WENN) —
Sylvester Stallone thanked Arnold Schwarzenegger for being "a fantastic enemy and a better friend" in a touching speech to mark the actor's 70th birthday on Sunday.
The "Creed" star was one of the famous faces at a bash to celebrate the "Terminator" actor's landmark birthday, and he took to the microphone to share a few words about his pal.
In a clip of the speech posted to Instagram, Stallone says: "You don't quit, you don't quit, and you still don't quit. It's boundless energy... But, you've been a fantastic enemy and a better friend. That's all I can say, bro. Congratulations."
Clearly thrilled with his friend's kind words, Schwarzenegger is then seen giving him a warm hug.
Stallone, 71, wrote the caption: "A little bit of my birthday speech to the Big Man ! It's actually a one of a kind competitive relationship which we are both grateful for! Keep punching , Arnold ! #arnoldschwarzenegger."
The actors have long been pals and friendly rivals, and have starred together in the movie "Escape Plan" and "The Expendables" franchise. They are also both known for their buff physiques and action skills, which Stallone referenced when he shared a side-by-side comparison picture of himself and Schwarzenegger at their physical peaks on Instagram, writing: "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!"
The pair's support of one another was also obvious last year, when Stallone lost out on the Oscar for his role in "Creed" and Schwarzenegger tweeted him: "To me, you're the best, no matter what they say."
And speaking to "Entertainment Tonight" previously about their friendship, Stallone explained: "You know, he's become such a close friend. We were so adversarial. It was like (boxing rivals Joe) Frazier (II) and (Muhammad) Ali, and he's become such a gentleman."