X Factor's Sam Callahan gets naked to greet London

Former X-Factor constant Sam Callahan won our hearts when he appeared on the show in 2013, and he's still impressing us three years later. He's been working not just on his singing career, but on his body too since we last saw him on X Factor.

Prepping for #XtraFactor tonight, who's watching?

A photo posted by Sam Callahan (@itssamcallahan) on Sep 24, 2016 at 12:12pm PDT

#BlueLableGroup Took pre and post work out photos today using @usnuk's B4-BOMB supplement combined with an intense workout. #CHALLENGEYOURSELF - #BlueLabelGroup

A photo posted by Sam Callahan (@itssamcallahan) on Sep 30, 2016 at 11:04am PDT

If you want something you've never had, you must be willing to do something you've never done. #JustBringIt

A photo posted by Sam Callahan (@itssamcallahan) on Sep 16, 2016 at 7:53am PDT

But the former Essex barman decided to welcome London in the best way possible; with a nude Instagram snap. Callahan took to Instagram to share the image and wrote, "Hello London".

HELLO LONDON

A photo posted by Sam Callahan (@itssamcallahan) on Sep 30, 2016 at 12:12pm PDT

Suffice to say, we're impressed. Callahan recently released his new single 'I Love It When You' and is said to be working on his debut album. More stories: The world’s hottest maths teacher Pietro Boselli goes totally nude in jaw-dropping new shoot ‘Scream’s Nico Tortorella and internet star Kyle Krieger reveal why their relationship ended