Ms Westacott, who has previously publicly described being bullied in school and having a violent father, said her AO for service to the private and public sector shows Australia is a country of opportunity.
In total, 1,057 people have received an award with 10% of the successful candidates come from a BAME background.
Liverpool legend Kenny Dalglish has been knighted and two-time Golden Globe victor Emma Thompson made a dame in the Queen's birthday honours list. I also welcome the Knighthood for Jim Ratcliffe, chair and chief executive of Ineos Chemical Group, who has built a business empire which contributes so much to the Scottish economy.
Other big name stars from the entertainment world who have also been recognised in the Birthday Honours list include actor Tom Hardy and actress Keira Knightley, who have been awarded a CBE and an OBE respectively. She has picked up an MBE for services to Paralympic winter Olympic sport.
Dennis Rodman arrives in Singapore ahead of Trump-Kim summit
Tensions between the two countries escalated in 2017 after Pyongyang stepped up efforts to boost its nuclear weapons programme. The White House says Trump will leave Singapore Tuesday, because the talks have "moved more quickly than expected".
HIV researcher Professor David Cooper was posthumously awarded the Companion of the Order of Australia for his eminent service to medicine, particularly in the area of HIV/AIDS research, as a clinician, scientist and administrator, to the development of treatment therapies, and to health programs in South East Asia and the Pacific.
Sister Imelda Poole, president of European anti-trafficking network Renate, receives an MBE for services to combating modern slavery.
These honours, which are handed out twice a year, once at New Year and again to mark the Queen's birthday, recognize ordinary people and celebrities, who have made achievements in public life or committed themselves to serving and helping Britain.
Since starting her career with the trust 15 years ago, Katharine has worked across a number mental health services, initiated projects to renovate outside space to be used for physical exercise and held weekly "Kat Chats" with the young people on the wards to get feedback about how services could be developed to improve their experience.