The Irishman wrote on his Instagram on Friday after Payne, who died from a hotel balcony fall in Buenos Aires Wednesday night, had attended Horan's concert in South America just two weeks ago.

Niall Horan is speaking out following the death of his former One Direction bandmate, Liam Payne, who died in Buenos Aries, Argentina, on Wednesday. He was 31.

Niall Horan has mourned One Direction bandmate Liam Payne in a heartfelt social media post, writing: "It just doesn't feel real."