'I knew there was a dance routine involved.
Writing to his 6.65million followers, the 41-year-old admitted that he was "overwhelmed" by the encouragement he's received.
McPartlin has also said that he was clinically depressed for a year but never told anybody "the very end".
Ant checked into rehab in June after he was rushed to hospital at 5am following an "insane" binge of painkillers tramadol and morphine, along with alcohol, while recovering from knee surgery, but has since left the facility and is back home.
Presenter Ant McPartlin bravely opened up on his addiction to drugs after entering rehab for two months and admitted he was drinking "too much to numb the pain".
In an interview with The Sun on Sunday newspaper this weekend about his battle, Ant recalled: "I was at the point where anything - prescription drugs, non-prescription drugs - I would take". 'And take them with alcohol. But it was the mixing pills with alcohol that was deadly.
"The ambulance came and took me to Chelsea and Westminster".
McPartlin said he was initially prescribed "normal stuff" such as co-codamol and codeine, but soon needed "opium-based" painkillers.
"The great thing is I spoke to a lot of the medical team and I'm not an alcoholic".
He continued: "But then we found my pain had been caused by a hole in my knee bone - it was shot".
"I was moved on to tramadol, which is where the real problems started".
Tweeting from the official account he shares with TV partner Declan Donnelly, the star said: 'Have to say I'm overwhelmed by everyone's love, support and well wishes today.
If you or a loved one may need support for a substance addiction, the NHS recommends that you speak first with your GP who can then advise on the appropriate course of treatment.
"It was a handwritten note from Harry sending all of his best wishes on behalf of him, William and Catherine and telling me well done for speaking out".