Conservative MP Louise Mensch has admitted she "probably" took drugs before dancing the night away at a jazz club with classical violinist Nigel Kennedy.
The racy novelist has published an email exchange with a man claiming to be an investigative journalist who made a series of allegations about her time in the music industry during the 1990s.
Among them were claims she took drugs at Ronnie Scott's in Birmingham and danced with Mr Kennedy while drunk in front of a group of journalists.
The MP for Corby and East Northamptonshire said: "Although I do not remember the specific incident, this sounds highly probable."
She added: "I thoroughly enjoyed working with Nigel Kennedy, whom I remember with affection.
"Additionally, since I was in my 20s, I'm sure it was not the only incident of the kind; we all do idiotic things when young."
Mr Kennedy was keen to distance himself politically from his old friend but recalled they had "great times" before warning potential foes she was "pretty scary".
Mrs Mensch rapidly built up a high media profile after being elected last May, particularly for her role as a member of the Culture, Media and Sport Committee that grilled the Murdochs and Rebekah Brooks over phone hacking.
The mother-of-three has penned a series of successful chick-lit novels, selling more than two million books worldwide, and recently married Peter Mensch, manager of rock group Metallica, dropping her previous surname Bagshawe.
Her frank and robust response to the email has won her a legion of supporters on internet sites with praise for her "chutzpah" and deft handling of the allegations.