dont believe everything you hear in tabloids. fallacys exist there and the truth is stretched to meet the needs of the celebrities they like, namely bieber. Judging by the footwear he has (surpas) which can support up to 1.5 inches inside the shoe, he gives the illusion that he is 2.5 inches taller. take into account his weight and the fact that he is around shorter girls, and it may seem that he is 5'9. the same tricks exist in cinema... (tom cruise and robert downey jr. appear to be 5'10 with massive shoes)
in truth, his height is at most 5'5''. the best site to check the heights of any celebrity is celebrityheights.com. reliable and actually does the best to judge.