Gregg played the part of Charity Fernbrook in Home and Away, who was a member of The Believers cult and prior to that was a midwife.
The character was in the show originally as a cult member but was brought back by force by Mama Rose to induce the labour of Tasha.
Gregg, a food and health blogger, also co-authored the cookbook Bubba Yum Yum: The Paleo Way for New Mums, Babies and Toddlers with celebrity chef Pete Evans and nutritionist Helen Padarin.
The book raised controversy after being called “potentially deadly for babies” by health experts.
Gregg married Australian Idol winner Wes Carr in April, 2012 and she gave birth to her first child Willow Harrison Carr in Sydney on 5 November 2012 at 11.49 pm, weighing 4.2 kg (9 lb 4 oz).