Bieber trying to be better for 2013

Justin Bieber has taken to his Twitter page to reveal he is 'trying to be better' in 2013.

Just hours after TMZ posted pictures of the 18-year-old heartthrob smoking what they alleged was marijuana, Justin - who hasn't commented on the claims - took to his Twitter page on Saturday to share his 2013 resolutions with his fans.

He wrote: 'Everyday growing and learning. Trying to be better. U get knocked down, u get up. I see all of u. I hear all of u. I never want to let any of you down. I love u.

'I'm ready. We are ready. See u all tomorrow and everyday after that. Back on tour tomorrow. Ready to see u all smile. Time to do what I'm supposed to be doing. Performing (sic).'

Justin has faced a number of challenges recently including the breakdown of his on/off relationship with Selena Gomez and the accidental death of a paparazzo who was taking pictures of the 'Beauty And A Beat' singer's car.

While Justin was not present when the tragic incident occured, he expressed his sorrow over the death.

He said in a statement: 'While I was not present nor directly involved with this tragic accident, my thoughts and prayers are with the family of the victim.'