WATCH: Justin Bieber Spotted Being A Brat Last Night

Bieber fan Keith Casey from Dublin was met with an awful impression of the young star who was spotted strolling out of a tanning bed salon on Grafton Street last night.

Passers-by, Casey included, were shocked by the singers demeanour and aggressive attitude.

Yikes... That footage doesn't come off too great for JB.

Keith had bought a ticket for the show, but now says he's going to give away his much sought out ticket following the exchange.

Justin is in town for two sold-out concerts at Dublin's 3Arena, tonight and tomorrow, as part of his Purpose world tour.