Aspiring model Natasha Gray, 30, was reprimanded after a stunned parent wrote an anonymous letter complaining about the 'provocative pictures'.
Miss Gray, who is the Head of PE and Dance at Manor Community College in Cambridge, is pictured wearing pink lingerie and stilettos on website iModel.com.
A caption on her 'Tasha' homepage, which promotes her modelling work, states she is 'willing to travel with expenses paid'.
In 2002, Miss Gray was named Britain's sexiest teacher after winning an ITV phone-in competition, just two weeks before she started her job at Manor Community College.
The angry letter from an unnamed parent said the 'inappropriate' pictures were 'common knowledge' among students as young as 11 at the school.
It read: 'I am a parent of a pupil at Manor Community College in Cambridge and was surprised when my child came home from school informing me that one of their teachers had some what I would call provocative pictures on a website.
'From doing a bit of digging, it is apparently common knowledge about these photos, and has been for some time.
'Any teacher is in a position of trust and surely this is inappropriate for not only the school, but also pupils.
'I am disgusted that, even if these were taken before she became a teacher, Miss Gray has not even attempted to remove them.
'I assume the pupils have a good giggle about it but I find it rather crass.'
Mother-of-two Claire Schofield, who is a governor at the secondary school and has one child there with another due to start in September, said she was surprised a teacher could be so careless.
'I would hope that any teacher would be able to be some sort of responsible role model to children at the school,' she said.
'I don't think she really thought this through.' Headteacher Ben Slade insisted the photos had nothing to do with the school but said Miss Gray would be severely reprimanded.
Oblivious: Head teacher Ben Slade said the photos are 'certainly a disciplinary matter' but that Miss Gray will not be suspended
He said: 'I knew nothing about this. It is not on the school's internet and we have very robust policies on how staff should behave in school.
'This will certainly be dealt with most severely and will certainly be a disciplinary matter.
'Teachers are entitled to their union representation and Miss Gray has been spoken to.
'She will asked to take the pictures down. This is not a matter for suspension, as much as I would like it to be in this case.
'If the pictures were more pornographic or if they involved someone of a dubious age it would be more serious.'
Following her win as Britain's sexiest teacher Miss Gray entered a competition against winners from six other professions to be named 'Britain's Sexiest'.
She was narrowly pipped to the top prize by a fitness instructor.Speaking after the competition she said: 'It was absolutely fantastic. I had such a brilliant day. The audience was great and helped me get into it.'
Miss Gray was unavailable for comment yesterday.
Battle ground: Manor Community College in Cambridge
Source: Daily Mail Uk.