Niall Horan and Shawn Mendes have left fans in a bit of a frenzy. The pair tweeted that they'll be working together in the future.

In case you didn't know, Niall Horan is a pretty big deal. The Mullingar native set heart's aflutter when he was one fifth of boy band One Direction. Ever since the band's "break," Horan has gone on to earn himself the most successful solo career out of any of his former band mates. Of course, it must all be down to that sultry Westmeath accent.

And in case you also didn't know, Shawn Mendes is arguably an even bigger deal. The 20-year-old artist has won over fans with his smooth dance moves, killer songs, and that heavenly smile of his. The Canadian singer has nearly 40 million followers on his Instagram page, and when he posts pictures like this, it's no wonder.

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Me and Penelope!!!! πŸ• also MERRY CHRISTMAS! ❀️

A post shared by Shawn Mendes (@shawnmendes) on

Now, Niall Horan and Shawn Mendes have had a playful to-and-fro on Twitter, and word has it that they're planning on working together in the future.

First, a fan tweeted Horan asking if it would ever become possible. They asked, "Niall will you ever give us a song with Shawn?"

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To which the 'Slow Hands' singer replied, "We're going to try."

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However, Mendes then entered the conversation, and concreted matters. He added, "We ARE going to!"

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This tweet was the tipping point for fans, and a frenzy is currently happening online. Two of the biggest male soloists in the world collaborating together? Genius.

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Until that moment arrives, here's Niall Horan and Shawn Mendes performing 'Mercy' together, which has been doing the rounds since the pair's announcement.