Payne spoke to ET's Katie Krause on Friday, where he called reuniting with Horan "fantastic."
"I mean we played a bit of Playstation yesterday in my hotel room in San Jose," he shared. "He came and hung out for a little bit, but it's just so nice to see him. I don't know, when you see someone you haven't seen for ages. you become the same person that you were with them. I don't know, it's very interesting."
Payne also talked about his holiday plans, his first one since welcoming son Bear in March.
"Well, I have a little nephew that's just been born as well, who's younger than Bear -- little baby Ashton.," he said. "It's gonna be a very baby full house. I imagine the happiness and love around is gonna be amazing."
Though One Direction went on hiatus in early 2016, Payne and Horan have reunited several times this year. The singers were both at KIIS-FM's 2017 Wango Tango music festival in Los Angeles and at the ZPL Birthday Bash in Indianapolis.
Zayn Malik, however, admitted this fall that he's lost touch with his One Direction bandmates.
"Our relationships have definitely changed since we were in a band together, but I think that’s just life,” the 24-year-old singer told Billboard. “Everybody grows up; two of the guys have got kids now. But no, I don’t talk to any of them, really.”
See more on the band in the video below.