English actress Keira Knightley poses nude for artist

English actress Keira Knightley has reportedly stripped off to pose naked for an acclaimed artist.

The Pirates of the Caribbean actress, who bared all to film a bath scene with Sienna Miller in their 2008 movie The Edge of Love, has allegedly been shedding her clothes during sessions at London's Halcyon Gallery for Mitch Griffiths, reports heraldsun.com.au.

"It's considered a great honour to be painted by Mitch. He is a highly respected nude painter and is painting a number of subjects for an exhibition next year. He is delighted Keira agreed to take part," said a source.

Keira Knightley boobs nicknamed 'little poached eggs'

Keira Knightley was left red-faced after the director of her new movie described her boobs as “little poached eggs”.

The ‘Pirates of the Caribbean’ actress shed her clothes for John Maybury’s ‘The Edge Of Love’.

But the 51-year-old filmmaker gave the nickname to Keira’s breasts during the film’s DVD commentary.

“I’m sure Keira will be far from happy,” the Daily Star quoted an insider as saying.