The musicians performed a few songs for onlookers on Grafton Street in the city.
Jacob Koopman, a musician, joined them for the impromptu performance on the well-known avenue.
Along with some of their original songs, including Slow Hands by Horan and Before You Go by Capaldi, the duo also covered Yellow by Coldplay.
Unsurprisingly, the impromptu set gathered quite a crowd, who were enjoying every second.
A busking performance that you’d definitely not ignore.
It seems like the former One Direction singer is enjoying his time in the Irish capital with the Scottish star.
The pair were also spotted outside the Guinness brewery, with Capaldi deciding to carry Horan in his arms and posing with each other
The two have been friends for several years, having first met in 2018, when Horan invited the Scot to perform at a gig in Glasgow with him. Capaldi went on to support the Irish singer on his Nice to Meet Ya world tour in 2020.