Slough MP Fiona Mactaggart, who once spent Red Nose Day dressed as a chicken when she was a teacher, has donated £14,268 to charity after thousands of people retweeted her post on social networking site Twitter.
Although she had always planned to write a cheque for Comic Relief, the Labour MP said she had the sum of £10,000 in mind, and admitted she was "a bit" worried as the number of retweets steadily increased.
It was spur of the moment. I had planned to give all day but doing it that way was spur of the moment. I think generosity should hurt a bit and one of the figures that has always shocked me is that poorer people give between 4% and 5% of their income to charity, and richer people give around 2% of their income to charity. We should step up to the plate.
Ms Mactaggart said the cheque has already been handed over to Comic Relief.
This year's Red Nose Day has raised more than £75 million so far.