Plastic surgeons today warned people not to have cosmetic surgery to try to gain celebrity looks.

The advice from the British Association of Aesthetic Plastic Surgeons (BAAPS) followed the publication of a survey which ranked the celebrities whose bodies are most admired by cosmetic surgery patients.

The survey by the Harley Medical Group (HMG), which runs 10 cosmetic surgery clinics in the UK and Ireland, found that model Kelly Brook's bottom was the most admired body part among 250 of its patients - with 82% ranking it as their favourite celebrity behind.

Other sought-after features included Sienna Miller's nose (38%), Scarlett Johansen's lips (71%), Kate Beckinsale's breasts (64%), Charlize Theron's hips (42%) and Keira Knightly's stomach (67%).

Among male respondents to the survey, actor Jude Law got the most votes for lips (55%), while the most-admired nose belonged to presenter Jamie Theakston (36%). Troy star Brad Pitt was considered to have the best body shape, winning 74% of the votes, compared with David Beckham who only scored 8%.

The HMG claim that with increasing numbers of people seeking to change their appearance cosmetically, many visit their surgeon with a particular celebrity's features in mind.

But Norman Waterhouse, president of the BAAPS, said that it was not advisable for people to undergo cosmetic surgery in pursuit of movie star looks.

Mr Waterhouse said: "One of the things surgeons must evaluate when interviewing patients is whether they have realistic expectations about the potential results. Wanting to look exactly like a celebrity is a classic example of unrealistic attitudes."

He added that most plastic surgery was geared toward enhancing a person's appearance while preserving their individuality. BAAPS advise patients seeking cosmetic surgery to speak to a qualified plastic surgeon when deciding what procedure is best for them.

Louise Braham, director of the Harley Medical Group, said that it was "incredibly important" that expectations were correctly established between the surgeon and patient before surgery.

She said: "The patient must feel sure that the surgeon understands precisely the effect that they are looking for, while the surgeon will want to be sure that the patient has 100% accurate and realistic expectations of the results of the surgery and what to expect during the post-operative recovery."

The most popular cosmetic procedures for women are breast enlargement, liposuction and nose jobs, while men mostly opt for liposuction and penis extensions.

Ms Braham said: "We would never say, 'Yes - we can give you Sienna's nose or Scarlett's lips'. Apart from anything else, what looks great on one person may be out of proportion or out of sync on another."

Dr Kerri McPherson, a body image expert at Queen Margaret University College in Edinburgh, said that some people felt pressured over what their bodies should look like by what they saw on TV and in magazines.

"Magazines and the media tell women how they should look, and they tell them they should have pert breasts, a well-proportioned face and thin waist," she said.

But Dr McPherson said that celebrities should not be blamed for making women want to look like them, as they often faced the same pressures.

"The fact that they can afford to change the way they look also adds more pressure on to other women who have not got the same income," she said.