Remember X Factor’s Sam Callahan? He’s looking very different these days after THIS incredible transformation

SAM Callahan first hit our TV screens as a timid X Factor contestant three years ago - now he's revealed his amazing body transformation in a series of social media snaps.

Wowing his fans, the former reality star showed off his rock hard abs as he worked out in the gym.

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One Instagram follower gushed: "Looking amazing babes", while another simply commented: "Inspirational."

In 2013 Sam turned heads as a cute, smiley-faced wannabe on the ITV1 singing competition.

Standing in front of judges Nicole Scherzinger, Gary Barlow and Sharon Osbourne, he performed a cover of James Blunt's You're Beautiful.

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The 22-year-old has been blogging about his recent transformation and wrote in one post: "I do have a slight advantage over a lot of people in the way of muscle memory.

"If you have been following me for a while you’ll know that I have always kept myself in "decent enough" shape and there have also been times in the past where I have been very muscly and had a very low body fat percentage which means that my muscle memory will allow me to get back to that physique faster than your average Joe."

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Sam added: "However, I don’t want that to discourage anyone, as the transformation you can make in a small amount of time can still be mind blowing given the right amount of commitment and work."

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