The singer admitted she was nervous about getting her kit off but didn't take much persuading because she felt so strongly about lending her support to the campaign.
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Alexandra Burke in the new PETA ad
"I was nervous about posing nude as I've never done it before," she said. "It was uncomfortable initially, but the photographer made me feel relaxed and at ease.
"Ultimately I love my body, so it was great to do something for such a worthwhile cause.
"When I found out what happens to animals on fur farms my heart just sank. I have animals and the thought of someone hurting them so they can be turned into a coat makes me sick.
"I can't imagine anyone would want to be caught dead in fur."