Gretel Killeen (born 3 February 1963) is an Australian journalist and author. She is well known for being the primary host of Big Brother Australia from its inception in 2001 until the 2007 season (including Celebrity Big Brother in 2002). Killeen hosted the 2009 TV Week Logie Awards. Killeen is a regular presenter on morning/talk-shows such as; Studio 10, Sunrise, Today and Mornings.