Shawn Mendes had a very special treat up his sleeve for fans at his O2 Arena show in London on Saturday night (Aug. 16). The ...

"Everybody, please welcome Mr. Niall Horan to the stage," Mendes told the crowd. In the video he shared on social media, the ...

Shawn Mendes brought out Niall Horan at his show in London for a surprise duet of "This Town." "I'll remember this for a long time," the "Mercy" performer told fans.

"This town is a ghost now / Feel like I used to know this city," he sings. "Now I can't even go out / In every corner, there's a memory." ...