Proudlock completed the 26 mile and 385 yards race near the River Thames on Sunday (26 April) in an impressive three hours and four minutes.
After completing the race he told fans: "So happy it's over, best feeling ever!!"
His model girlfriend Emma was also there cheering him on along the way, and once he finished, she was on hand to give him a cuddle.
Posting a photo to Instagram, Emma said: "Post marathon cuddles with my absolute champion who completed in 3hrs 4min. So proud!! @proudlock."
Reality star and Serge DeNimes owner Proudlock couldn't have looked happier as he held his medal for all to see.
Proudlock was running on the behalf of the British Heart Foundation has raised more than £2000 for the charity. He previously revealed that the BHF was a charity close to his heart as his family have "a history of heart conditions".
Viewers can currently watch Proudlock on screen in the new series of Made In Chelsea, which airs every Monday at 9pm on E4.
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