A TEACHER at posh Harrow posed for a secret topless snap – which was then nicked and passed around hundreds of schoolboys.

Art tutor Joanne Salley, 32 – once a presenter on TV's Big Breakfast – got a fellow female teacher to take saucy pictures of her.

But she fled the elite £30,000-a-year boys' school in tears after they were found on a memory stick by a pupil – then passed via email among the 825 gleeful lads.

They were also circulated among boys at her old school, the private Merchant Taylors' in nearby Northwood, Middle­­sex. A Harrow source revealed: "The pictures were on a memory stick in the photography studio and one of the boys looked at them.

"He was obviously very impressed because he decided to show them to his pals. Then suddenly it seemed everyone had had a look."

One sixth-former at Harrow, whose old boys include Sir Winston Churchill, added: "Everyone thought Miss Salley was a babe, so naturally the photos went around like wildfire."

The former Miss Northern Ireland – an ex-girlfriend of retired England rugby ace Matt Dawson – is said to have posed for tutor Fiona Corthine.

Joanne was described as "upset" about the scandal and remained absent from the school yesterday.

One of her pupils said: "She's a really good teacher. She's really funny, lively, nice to talk to, charismatic and beautiful. We want her back."

Harrow said the snaps were "stolen" and it was investigating. Headmaster Barnaby Lenon voiced support for her.

He said: "Joanne Salley is a long-standing and suc­cess­ful art teacher at Harrow who has in the past been a model. Photographs of her modelling were taken by a professional photographer who also teaches at the school.

"They were stolen and passed on to some pupils without the photographer's agreement.

"Joanne was understandably very upset. She's a very good teacher who also contributes to a lot of things like the Duke of Edinburgh Awards."