Mr Fabricant, 67, who has previously described himself as "not exclusively gay", was asking the prime minister to support the bid to host the 2022 Commonwealth Games in the West Midlands when Mrs May revealed his appearance on the dating show.
The revelation in Parliament came after Mr Fabricant asked the Premier about the West Midlands' bid for the Commonwealth Games.
He's well known in the House of Commons for his trademark blond hair but Tory MP Michael Fabricant is set to bring his sense of fun to a wider audience on Channel 4's Celebrity First Dates.
Mrs May questioned if Mr Fabricant would be the celebrity or first date.
'What I'm not sure about is whether he is the celebrity or the first date'.
Mr Fabricant said he was taking part to raise money for Cancer Research, which would receive his £25,000 fee.
The celebrity version of the popular reality show has previously included television presenter Esther Rantzen, EastEnders actor Richard Blackwood, weather presenter Sian Lloyd and Vamps lead singer.
Mr Fabricant was first elected Conservative MP for Lichfield, Staffordshire, in 1992.