Bureaucrats responsible for running Parliament House won't say which MP signed in the man known as the "human Ken Doll" for a Liberal Party fundraiser on budget night.
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Prime Minister Malcolm Turnbull, Foreign Minister Julie Bishop and Senate President Stephen Parry were among Liberal MPs who posed for photos with Justin Jedlica at post-budget events at Parliament and Canberra's Hyatt Hotel.
The plastic surgery advocate and social media personality claims to have had hundreds of cosmetic procedures and describes himself as a "pioneer of the modifiable male aesthetic".
Labor senator Kimberly Kitching used Senate estimates hearings to ask if Mr Jedlica had attended an event in the Cabinet suite of Parliament and which member or senator arranged for the required security passes.
BuzzFeed News first reported Mr Jedlica posed for photos with Mr Turnbull and other MPs, using hashtags including "#federalbudget2017, #richkidsofinstagram and #richkidsoftoorak".
Senator Kitching asked officials from the Department of Parliamentary Services to explain if guest lists for private events at Parliament House were supplied and if any security or background checks were completed.
Attorney-General George Brandis told the hearing he had never heard of Mr Jedlica and that Mr Turnbull's office had no role in his attendance at the event.
"I do not think anybody at this table is likely to have heard of this benighted individual," Senator Brandis said.
On Friday, the department told the estimates committee the party was a private event.
"Mr Jedlica's name was on the pass application list, along with 27 others.
"Upon arrival for the event, Mr Jedlica had his identity verified by security branch staff at a pass issue table inside the marble foyer and his name marked on the attendance sheet, before he was issued with a function pass.
"Function pass holders are required to be escorted at all times within the private areas; DPS does not have records of which areas visitors are escorted to."
Although sign-in records are held electronically for seven years, the department said it would not reveal who had arranged Mr Jedlica's security pass to protect the MP's privacy.
"The names of the sponsoring parliamentarian cannot be provided as this data is considered a matter of parliamentary privilege," the department said.
Officials initially told the committee MPs' privacy had been considered in the decision not to release the information. The department later said this was incorrect.
