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 ...

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 ...

Shawn Mendes invited former One Direction singer Niall Horan to join him for a surprise duet of Horan's debut solo single ...