Johanna Leigh Griggs AM (born 17 October 1973) is an Australian television presenter and former competitive swimmer. She won a bronze medal at the 1990 Commonwealth Games. Griggs has been at the Seven Network since 1993 where she joined Seven Sport, first as a host at the Australian Open. She hosts the network's Olympic Games, Commonwealth Games and the Australian Open, as well as being a presenter of their Melbourne Cup coverage. She has been the host of Better Homes and Gardens since 2005 and House Rules from 2013 until 2019.