Best Bromance Ever! Patrick Stewart and Ian McKellen Kiss at 'Mr. Holmes' Premiere

Just when you thought Patrick Stewart and Sir Ian McKellen couldn't get any cuter, they kiss!

The best friends locked lips at the London premiere of McKellen's movie Mr. Holmes while Stewart's wife, Sunny Ozell, watched. She didn't seem to mind and neither did the actors' fans.

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The event was held at London's ODEON Kensington cinema and featured a set that looked like the fictional detective's Baker Street residence. Instead of a red carpet, the premiere had a long carpet that resembled a cobblestone road.

This isn't the first time we've gushed over Stewart, 74, and McKellen's adorable bromance. In September, Stewart got the 76-year-old Lord Of The Rings star to officiate his wedding. McKellen posted a pic proving he was ordained on his Facebook, writing: "I did my part."

The friends -- who star in the X-Men movies as Professor X and Magneto -- have also gotten really good at taking friendship photos.

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Here they are holding hands in New York City in March 2014. The actors have starred in two Broadway plays together: No Man's Land and Waiting for Godot.

And they're great at goofy faces!

How fun would it be to play skee ball with Captain Jean-Luc Picard and Gandalf?!

McKellen and Stewart certainly aren't above a spoof. Here they are photoshopped on Kim Kardashian and Kanye West's Vogue cover!

They've posed on Citi Bikes:

In front of a Kate Middleton billboard:

On the Brooklyn Bridge:

And behind Wall Street's Charging Bull:

Get these two break-apart necklaces already!