Former deputy prime minister Barnaby Joyce has updated his parliamentary records to confirm his former media adviser is now his partner.

Key points: Mr Joyce announced relationship with Vikki Campion on February 13, but only updated register of interests to include her on March 19

Mr Joyce announced relationship with Vikki Campion on February 13, but only updated register of interests to include her on March 19 Relationship prompted Malcolm Turnbull to change ministerial standards to specifically ban sex between ministers and staff

Relationship prompted Malcolm Turnbull to change ministerial standards to specifically ban sex between ministers and staff The couple is expecting a baby next month, though Mr Joyce has said the paternity of the child is a "grey area"

Mr Joyce quit as deputy prime minister last month amid pressure over his relationship with his staffer Vikki Campion and questions about whether the statement of ministerial standards was properly followed.

Ms Campion moved from Mr Joyce's office to working for his Nationals colleague Matt Canavan last year.

The ministerial standards mean prime ministerial approval must be given if family members or partners are employed in another frontbencher's office.

But Mr Joyce denied Ms Campion was his partner at that time, so argued that rule did not apply.

Ms Campion is expecting a baby next month, although Mr Joyce has said the identity of the child's biological father is a "grey area".

But he said despite that, he would not have a paternity test and would raise the child as his own.

He confirmed Ms Campion as his partner on February 13 but only updated his register of interests to reflect that last week, on March 19, which is just outside the 28 days required for updates to be made.

His register of interests now shows the update made in January — that he had separated from his wife Natalie — as well as the from last week showing Ms Campion owns a property in the Canberra suburb of Braddon, and some shares.

He has deleted the declaration showing the gift of six months' rent-free use of a townhouse in Armidale in his electorate of New England.

Mr Joyce's relationship with Ms Campion prompted Prime Minister Malcolm Turnbull to change the ministerial standards to specifically ban sexual relations with their staff.

Mr Turnbull also wrote a new foreword to the document stating that he had added a "very clear and unequivocal provision: ministers, regardless of whether they are married or single, must not engage in sexual relations with their staff".

Mr Joyce is now a backbencher after quitting the Nationals leadership, but he has not ruled out returning at some stage.

The Nationals chose Michael McCormack to replace him as Deputy Prime Minister.