Barnaby Joyce's new partner Vikki Campion gives birth to baby boy

The baby that led to former Australian deputy prime minister Barnaby Joyce's downfall has finally arrived into the world.

Mr Joyce and his partner Vikki Campion welcomed their baby boy, Sebastian, on Monday. This is Mr Joyce's fifth child, although his first with Ms Campion.

Known for campaigning on strong family values, Mr Joyce announced he was separating from his wife of 24 years in December 2017.

In early 2018, it was revealed the separation was due to an affair with his staffer Ms Campion, who fell pregnant.

He was forced to resign as leader of the National Party and deputy prime minister in the aftermath.

In March, Mr Joyce caused further controversy by claiming the baby might not be his. He called the Sebastian's paternity a "grey area", but would raise it as his own, the Sydney Morning Herald reported.

Prime Minister Malcolm Turnbull was vocally unimpressed with Mr Joyce's conduct, calling it a "shocking error", and implementing a ban on sexual relations between ministers and staff.

"Barnaby made a shocking error of judgment in having an affair with a young woman working in his office," Mr Turnbull said at the time.

"In doing so, he has set off a world of woe for those women and appalled all of us."

Mr Joyce remains married but separated from his first wife, Natalie.

Newshub.