The 21-year-old had been missing since the attack started on Saturday night and her family desperately appealed for any information of her whereabouts.
But their worst fears came true when Sara, who was out celebrating a new job in Westminster with a friend when she disappeared, was confirmed as the fifth victim.
Her devastated mum, Julie Wallace, revealed the news on Facebook today after flying to London to find her 21-year-old daughter.
She wrote: ”Sara Zelenak is confirmed dead, they found her body and has DNA tests confirmed.
“Thank you for all the overwhelming love and support from everyone.”
Sara’s stepfather, Mark Wallace, shared a video of Sara online, writing: “I really miss that funny little laugh.”
Friend Elle Bishop added on Facebook: “I find solace in the fact that the hate that saw you taken from us, you have never felt inside, making you a remarkable young woman.”
Sara, from Brisbane, Australia, nearly attended the Ariana Grande concert in Manchester that was targeted by suicide bomber Salman Abedi last month.
She became separated from her friends after terrorists Khuram Shazad Butt, Rachid Redouane and Youssef Zaghba ploughed into pedestrians on London Bridge.
Her pal Pri Gonçalves was with her when they began running fro the van – and she believes Sara was slowed down by her high heels.
She added: “I ran thinking she would be running with me but I looked back and she wasn’t there.”
Australian Minister for Foreign Affairs Julie Bishop said: “The Australian Government is deeply saddened to confirm that two Australians have been killed in the London terrorist attack.
“We continue to work with the United Kingdom authorities who have asked that we await official confirmation of the identities of the victims, and for the families to be officially notified, before we release their names.
“The Australian Government has remained in close contact with the families who have requested privacy.”
Australian nurse Kirsty Boden was also confirmed as a victim of the attack after “running towards danger” to help the victims.
Top pic: Facebook