Stephen Sutton was diagnosed with cancer in 2010 but in 2012 was told it was incurable.
"Today I ticked number 30 off my bucketlist- "Hug an animal bigger than me"!!"
He made a bucket list which included crowd surfing in a dinghy and playing the drums at a Wembley Cup Final, but he also aimed to raise £10,000 for the Teenage Cancer Trust.
After raising that total, he upped the goal to £1million and comedian Jason pledged his support by donating £10,000 and asking his Twitter followers to donate.
The online response then exploded and other celebrities pledged their support and donated, with John also donating £10,000.
I have just saw the latest fundraising total http://t.co/uklmWvSmmO— Stephen's Story (@_StephensStory) April 23, 2014
But seriously... Wow. Just wow. Thank you all so much :)— Stephen's Story (@_StephensStory) April 23, 2014
Have spoke with Stephen’s Dad on text and Stephen has seen our efforts and is massively grateful. The guy is a legend!— JasonManford (@JasonManford) April 23, 2014
On Tuesday Stephen posted his final Facebook post saying: "It's a final thumbs up from me! I've done well to blag things as well as I have up till now, but unfortunately I think this is just one hurdle too far. It's a shame the end has come so suddenly- there's so many people I haven't got round to properly thank or say goodbye too. Apologies for that."
In the hours following the messages, the campaign reached their goal as over £400,000 was donated, and on Wednesday Stephen tweeted to confirm the goal had been reached and thanked his followers.
He added: "All future updates on this page will probably be from a family member. I hopefully may have the energy to write a few tweets (@_StephensStory). I will continue fighting for as long as I can, and whatever happens next I want you all to know I am currently in a good place mentally and at ease with the situation.
"That's it from me. But life has been good. Very good."