But the two best friends have been supporting each other for years in amazing ways. One look at Stewart's Twitter feed and you'll know exactly what we mean.
Here are 5 reasons that the world needs more friends like these two and why they have the best bromance in all of Hollywood!
1 - McKellen Officiated Stewart's Wedding
When Stewart tied the knot in 2013 to jazz singer Sunny Ozell, guess who was there to make it official -- McKellen, according to Entertainment Weekly.
“I’m going to marry Patrick,” McKellen said in 2013 on "The Jonathan Ross Show," bringing the crowd to laughter.