Justin Bieber has admitted he has encountered some "crazy stuff" whilst in the UK - but he says it is now "all smiles".

The Canadian singer has endured something of an ordeal in recent weeks as he brought his Believe world tour to Britain.

He was denied entry by a Manchester club before tweeting a few days later that he had just gone through his "worst birthday" ever.

The singer then faced criticism for turning up late for a gig at London's O2 Arena before falling ill on stage at another concert.

Yesterday (March 8) the 'Boyfriend' star was taped lashing out at a cameraman, but he successfully performed at the O2 Arena afterwards.

Taking to Twitter, Bieber admitted that he was still affected by his recent health trouble but he added he has actually enjoyed his time in London. He said:

"Still a little short of breathe tonight but was an incredible show. London fans go hard! 4 SOLD OUT O2 shows in a row!! #BLESSED. Too many blessings to allow the stress in. the press made things look nuts but really I have enjoyed London. The fans are incredible."

Bieber continued: "So while I have seen some crazy stuff it is all smiles. Im gonna get some rest and keep doing what i love. Entertain all of u. Thanks." Watch Justin Bieber perform live below: