Canadian teen heartthrob Justin Bieber has cancelled one of two scheduled concerts in Portugal next week, just after completing what he admitted had been a rough week in London, promoters said Saturday. Within a few days, the 19-year-old pop sensation angered some of his fans for being late on stage, then suffered a health scare and was involved in a foul-mouthed confrontation with a photographer. Music promoters \"Everything is new\" said on their website that Bieber cancelled his Tuesday Lisbon concert \"due to unforeseen circumstances\", but insisted the teen idol was still keen to perform on Monday. A Portuguese newspaper had said that, while the first date was sold out, ticket sales had been suspended for the second night due to insufficient demand.