Former X-Factor constant Sam Callahan won our hearts when he appeared on the show in 2013, and he’s still impressing us four years later.

The hopeful appeared in series 10, and ended up getting eliminated six weeks into the live shows.

Since then he’s been working on his music and busy hitting the gym hard to transform himself – and today he turns 23-years-old (May 10).

Check out some of his best bits below: