Ex-convicts poked fun at one of their old prison guards after a naked photograph of her at a nudist camp emerged online.

The blonde woman had her arm around a man - who was also nude - as the pair stared out into the sea.

One of the former inmates at the prison where she stills works posted it online and invited others to 'guess the screws a***'.

She wrote: 'Guess the screws a***… been doing a lil stalking this morn (sic), couldn't believe what I found…she's a nudist.'

A photograph of the female prison guard looking out into the sea without any clothes on has emerged online

The prison guard, who is thought to still work at Styal Prison in Cheshire, posted the picture on her Facebook page, according to Joe Hinton at the Daily Star Sunday.

A screenshot of a conversation believed to have been written after the picture was uploaded was found by the former inmates.

One friend of the guard wrote: 'Oh Matron!' and the officer replied: 'And you've seen the front view.'

Meanwhile, another friend added that they now feel 'left out' having not seen the front.

A conversation on Facebook which was posted after the picture was uploaded online was also found

The female prison guard is believed to still be working at Styal Prison in Cheshire (pictured)

The guard added: 'One of the few in the village!'

The person who posted it online described her as an 'internet sensation' while another quipped that she was going to 'inbox her'.

But viewer came to her defence and added: 'Must admit nice a*** though xx'

A source at the prison told the newspaper that there is going to be a 'lot of laughs at her expense in the next few weeks'.