Matt Hancock has declined to comment on reports he is having an affair with his aide Gina Coladangelo in the Department of Health.
The Sun revealed pictures of the Health Secretary appearing to be embracing his aide, who he hired last year with taxpayers' money, in what the newspaper called a "steamy clinch".
Mr Hancock, 42, appeared to be kissing Ms Coladangelo, 43, in what seemed to be CCTV footage taken from the Department of Health's London headquarters.
The Health Secretary has been accused of cheating on his wife of 15 years with Ms Coladangelo, who is a close friend, lobbyist and taxpayer-funded adviser to his department.
Mr Hancock appointed Ms Coladangelo to the Department of Health and Social Care (DHSC) as an unpaid adviser on a six-month contract in March last year, and appointed her as a non-executive director in September.
Mr Hancock and his wife, Martha, have three children together. Ms Coladangelo is also married with three children.
Ms Coladangelo is the communications director at Oliver Bonas, the fashion, jewellery and homeware store founded by her husband, Oliver Tress.