Johnny Depp was an unexpected guest at a Justin Bieber concert at the weekend.

The Hollywood actor took a break from filming the latest Pirates Of The Caribbean film to watch the teen star in Miami.

Depp, a keen music fan, apparently tried to keep a low profile at the concert but his attendance was revealed by Bieber.

The singer told fans at the American Airlines Arena: “Johnny Depp wants to hear 'Baby',” referring to one of hit songs.

Depp's interest in Bieber is a sharp contrast to his normal indie tastes.

The actor has previously featured on Oasis' song 'Fade Away' and is currently working on a documentary about Rolling Stones guitarist Keith Richards.

(by Jason Gregory)