They set tongues wagging last month when they jokingly announced they had gotten engaged just days after meeting in Japan.
And Katy Perry and Niall Horan appear to have struck up a firm friendship following the lark.
The pop princess and One Direction star dined together at Soho House in New York City on Wednesday, but were seen entering and exciting the members-only club separately.
The pair jokingly declared they were engaged after meeting in Tokyo last month.
Niall uploaded an Instagram picture of the two cosying up to each other, before tweeting: ‘she said yes! It’s happening! Haha,’ he announced.
The 20-year-old originally posted the offer after watching her perform current single Roar on The X Factor, and he got his answer during their reunion on Friday.
The singer is currently dating John Mayer – her first serious commitment following a doomed 14-month marriage to Russell Brand, the inspiration for many of the autobiographical lyrics on her new album.
And it seems their blossoming friendship is already being mocked by Niall's bandmates, as the group's main member Harry Styles starred in a joky tweet from actor Zach Braff.
I think the most surprising thing is that John is mature enough not to flip shit over her hanging out with another guy.