At Saturday evening's concert in Las Vegas, Elton surprised the audience when he invited his young son to join him during the encore.
The five-year-old, dressed in a suit like Elton's, sat alongside his famous father.
Elton put up a picture of the pair on his Instagram account, captioning the post: "Elijah joins daddy for the encore."
Followers were quick to comment, with one writing: "Oh my goodness, so special! What an amazing photo."