By Sarah Robson
John Key and Malcolm Turnbull are taking their trans-Tasman bromance to the next level: the Australian prime minister has invited his Kiwi counterpart for a sleepover at his Sydney mansion.
The pair held their first formal talks of the year on Friday, but it hasn't only been political announcements that have been making headlines.
Once they're finished with their official duties, Mr Key and his wife Bronagh will be taking the ferry across to Mr Turnbull and his wife Lucy's home at Point Piper for a private dinner on Friday evening.
But the Keys have also been invited to stay the night - an unprecedented move that's been dubbed "pyjama diplomacy" by one Australian newspaper.
It's reported Mr Key will be taking along a couple of bottles of New Zealand wine.
"We're looking forward to it," Mr Key told reporters.
"It'll be a fun time."
Mr Turnbull said he and his wife are "very, very hospitable".
Asked if he'll extend the same invite to other world leaders, Mr Turnbull responded: "We'll just start with the Keys I think and see how we go".
On Saturday morning, the two prime ministers could end up kayaking on Sydney Harbour or checking out some of the local eateries.
Mr and Mrs Key won't be joined by their son Max, who travelled with them to Sydney on Thursday afternoon.
Mr Turnbull has opted to remain at his private residence, rather than live in the prime ministerial residence at Kirribilli.
Mr Key has frequently enjoyed private dinners with Australian prime ministers and their partners over the years.
He developed a close relationship with Julia Gillard and her partner Tim, and even invited them to come over to spend some time at his Omaha bach after Ms Gillard was rolled by Kevin Rudd in 2013.
Mr Key said the Turnbulls would be more than welcome to stay.