the bright yellow advert for protein world has been put up in a number of london underground stations and features a model in a bikini with the question : ` are you beach body ready ? ' .
but the campaign , which promotes the brand 's weight loss collection , has attracted the ire of many social media users and body image campaigners .
now katie hopkins has waded into the row , dubbing those who have been vandalising posters ` chubsters ' , and saying they should turn their efforts to exercising instead .