Is another member of One Direction off the market?

Last month, Niall Horan tweeted his proposal to Katy Perry and on Halloween — while both were at a Tokyo radio station — she gave him her answer.

"She said yes ! It's happening! Haha," Niall wrote with an Instagram pic of the pair standing cheek-to-cheek.

But while they look awfully cute together, we're pretty positive Niall won't be taking a walk down the aisle, like his engaged bandmate Zayn Malik, since Katy seems very happy with boyfriend John Mayer.

That didn't stop Niall from stealing a kiss from his "lovely wife," though, and posing with his "groomsmen," the rest of the boys of One Direction.

"Today was so fun at music station in Tokyo!" Niall went on to tweet. "Had such a laugh with the lads and @katyperry ! Love that girl!"

Niall's love for Katy goes way back. Fans may not know that the "Roar" singer was pretty instrumental in helping to jump-start his career. In 2010, Perry was a guest judge on the "X Factor" U.K., where she cast the deciding vote to let Niall, who she called "adorable," through to boot camp.

Since then, the two haven't been shy about showing their admiration for each other, with Perry personally congratulating Niall in 2012 on Twitter when 1D's album, Up All Night hit #1. Later that year, they sealed their "relationship" with a kiss at the 2012 Video Music Awards.

A year later, just before the 2013 VMAs, Niall reminisced about the smooch: "I don't think there will ever be anything cooler than kissing her... until I marry her maybe!"

Well, Niall, your wish came true ... sort of!