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."