The actress snatched the title from Leona Lewis, who was voted top vegetarian in 2008 and 2009.
The House star admitted that she's delighted with the honour.
'I am really honoured, and very inspired to continue living the vegan lifestyle that has been so good to my body, my animal friends, and the world we live in,' the Daily Star quoted her as saying in post on her blog.
Photograph: Danny Moloshok/Reuters
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