The parents of 10-year-old Matilda, the youngest victim of the Bondi shooting, have tied the knot in Sydney.

Valentyna Poltavchenko and Michael Britvan have announced on social media their wedding yesterday in a “semi secret” ceremony at Admiralty House on the foreshore of Sydney Harbour.

“The plan was a small, semi-secret ceremony at Admiralty House with a very limited group of family and close friends. Simple, quiet, low-key… the kind of plan that should have stayed nicely under the radar,” Britvan posted on Instagaram.

“And to be fair, it worked perfectly… for most of the ceremony — until my sister (who I love very much) discovered the Facebook livestream button.”

Britvan’s post went on to say “people probably assumed we had already been married for about 10 years anyway… so this was really just us finally making it official”.

The announcement was greeted with congratulations.

“Matilda is smiling from above,” one Instagram message said.

“Congratulations to a beautiful family,” another said.

Matilda, 10, was among 15 people killed on December 14 when two gunmen, alleged to be father and son Said and Naveed Akram, opened fire on the gathered crowd at the Chanukah by the Sea celebration.

Her parents emigrated to Australia from Ukraine but met in Sydney, and named her Matilda as she was their first child born down under.

In the wake of the Bondi shooting, they declared they did not want their daughter’s death to become a political symbol and appealed for community unity.