Allegra Stratton, a former BBC and ITV journalist, publicly apologised for her behaviour which was filmed as she conducted a mock news conference last December.
Video footage of the then Downing Street aide, which emerged earlier this week, saw the row over the alleged party escalate.
Even Tory MPs have expressed anger at her joking while the country was under lockdown.
Ms Stratton announced her resignation outside her London home.
The drama unfolded just two hours after the Prime Minister had told MPs he was “furious” about her conduct. She said: “My remarks seemed to make light of the rules – rules people were doing everything to obey. That was never my intention.
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