Twitter Gold: Sam Callahan's shirtless selfies

For X Factor hunk Sam Callahan has been at working hard at the gym if his latest selfies are anything to go by – and judging by how low those jeans are riding he also needs to invest in a new belt. What would his mother say? Take a look at the bulge-tastic shot below: Sam Callahan Sam Callahan2 If you fancy more from Sam Callahan – click here to take a peek at some half-naked snapchats that he sent to a lucky fan. More 'X Factor' hotties on ‘X Factor’ Fitties: Jake Sims from Louis’ unnamed boyband X Factor’ Fitties: Tom Mann from Louis’ unnamed boyband ‘X Factor’ Fitties Hall of Fame: Jake Quickenden