In a statement released via Channel Seven, the heartbroken star and her husband Chrys Xipolitas made the devastating announcement.
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“It is with great sadness that we need to share some news with you,” said the couple, parents to two-year-old Johnas. “Our baby boy Harrison was delivered stillborn on Thursday 7 August 2014.
“We appreciate your love and support as we mourn the loss of our precious son. We understand that we have lived some of our lives in the public eye. But we respectfully ask for privacy at this difficult and extremely painful time so we can grieve and heal.
“With love Ada, Chrys and Johnas.”
Ada and Chrys’s first child Johnas was conceived through IVF in 2011 - the couple had tried to conceive naturally for more than a year.
The actress, who plays Leah Patterson-Baker in the hit Australian soap, announced her surprise second pregnancy to New Idea magazine in March.
“For it to happen so quickly after we struggled for so long last time is a really nice surprise and we feel really really lucky,” the 37-year-old said.