Elton John says there's a deeper meaning behind the biopic drama, "Rocketman", which tells the story of his young life until he found sobriety.
Egerton was visibly moved to tears after the premiere.
But it also celebrates some of John's enduring friendships, including with Bernie Taupin, who penned the lyrics to his greatest hits, including "Your Song", which helped propel the singer into superstardom.
Egerton, who plays the music legend in the biopic, did all his own singing for the film.
Ahead of the screening, Egerton also shared a sweet moment with the man he's portraying on screen, when he got down one one knee to tie John's shoe.
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"This has been a very emotional night for me".
"Elton John has released a new song with actor Taron Egerton, fittingly titled "(I'm Gonna) Love Me Again".
"Even if the movie doesn't make one penny at the box office - which will kill (Paramount Pictures chief) Jim Gianopulos - it is the movie I wanted to make", John said from the stage.
Elton John has defended the casting of straight actor Taron Egerton in Rocketman. I don't think I could have done it if he was around a lot.
The song, which plays in the credits for Rocketman, sees Elton revisit his signature '70s sound - and throughout it's hard to separate Elton and Taron's voices. I trusted them to do what they needed to do, artistically, and, listening back, I've been astonished with the results.
Elton John hammed it up for the cameras.