Justin Bieber has thanked his fans for helping him to reach the 40 million mark on Twitter keeping him in the number one spot on the micro-blogging site.

Writing on his Twitter page, @justinbieber, the 19-year-old said: "#40MillionBeliebers – thank u. I love u. #grateful [sic]"

He later added: "#40Millionstrong" and the hashtag then started trending worldwide yesterday.

He followed that up with a screenshot of when he had just 40 followers when he joined Twitter in September 2009.

The singer now has 40,068,979 followers on Twitter.

Justin Bieber's Tweet

Justin Bieber takes a look at his Twitter progress