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Last year, Mendes made a surprise appearance to perform “Treat You Better” during Horan’s headlining show in London<\/p>\n<\/p><\/div>\n
\n\tIf the whole world were watching, Niall Horan<\/a> and Shawn Mendes<\/a> would still make surprise appearances at each other\u2019s concerts. Mendes recently kicked off the On the Road Again Tour,<\/a> his first time back on the road since cutting the Wonder<\/em> tour short in 2022 to prioritize his mental health. The singer-songwriter celebrated his latest London stop with special guest Horan, who joined to perform his Flicker <\/em>single \u201cThis Town\u201d at the O2 Arena.<\/p>\n \n\t\u201cEverybody, please welcome Mr. Niall Horan to the stage,\u201d Mendes told the crowd. In the video he shared on social media, the audience screamed and sobbed in response. Horan and Mendes both played guitar as they sang together. Before leaving the stage, Horan added, \u201cI love you, and I love this guy. Take care of him.\u201d In March 2024, Mendes appeared during the London stop on Horan\u2019s tour to perform his single \u201cTreat You Better.\u201d<\/a><\/p>\n \n\t\u201cI\u2019ll remember this for a long time \u2764\ufe0f,\u201d Mendes captioned the post. \u201cThank you so much London x.\u201d <\/p>\n \n\tThe night marked a return to the stage for Horan, too. The musician completed his run on The Show: Live on Tour<\/a> in October 2024, just days before his One Direction bandmate Liam Payne died at the age of 31.<\/a> Coincidentally, the final tour One Direction completed together was also titled On the Road Again. One of Payne\u2019s last public appearances was at Horan\u2019s concert in Argentina.<\/p>\n