Gretel Killeen (born 3 February 1963), is an Australian journalist, newspaper columnist, author and TV personality, who hosts the Australian version of "Big Brother", since 2001. In between "Big Brother" commitments, Killeen works as a freelance writer and author, and can also be heard on Sydney and Melbourne radio stations. She is also a national ambassador for UNICEF in Australia, receiving her appointment as such in 2001. Wikipedia
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