The Only Way Is Essex star James `Arg' Argent was so unfit last month he could not run any distance.
However, after a stint at bootcamp training the 24-year-old has completed the London marathon.
Argent crossed the finish line with a time of 06:01:01 and raised £3,308 for Cancer Research.
After the race, the star tweeted: "6 weeks ago i was 18 stone and couldnt run down my road. Just completed London Marathon.
"Received so much stick n lots believed i wouldnt do it but proved those Haters/Doubters wrong! Hope Grandad Seamus is proud! #CancerResearch."
Arg was joined by his TOWIE co-stars Cara Kilbey and Billi Mucklow, who finished with times of 05:47:45 and 06:02:37 respectively.
After deciding to attempt the race, he went to bootcamp in Marbella with co-stars Gemma Collins and Joey Essex.
Arg lost three stone and to compete his new image has new veneers on his teeth and had his eyebrows shaped.
Recently Argent admitted he decided to lose weight after he was slagged off by QPR's captain Joey Barton.
Barton tweeted: "Leave it u stonehenge teeth. Cheeky man giving it bigguns, leave it large undies.
"Right fatty now ur fair game. Can't believe ur giving it with them teeth like a burnt down fence."
Arg told the Daily Star: "Joey Barton had a real pop at me on twitter. I don't really care now. He's just a bully.
"But the stuff he said about my teeth really got to me. I had been planning to have them fixed for a while and it did give me that extra push.
"I'm definitely looking better than Joey now!"
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