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Justin Bieber obeys his parents even though he "doesn't have to".

The 'Boyfriend' singer - who was the subject of pictures posted online last week that were claimed to show him smoking marijuana - finds it "reassuring" that he has the ability to "shock" his mother Pattie Mallette and father Jeremy Bieber, but has no intention of doing anything they wouldn't approve of.

The 18-year-old star told Top of the Pops magazine: "I still obey my parents, but I don't have to. I could shock them too.

"If I really wanted to do something that I know they wouldn't agree with, then I could do that now. Somehow that's reassuring."

However, the star said his loved ones need not worry, because he's not about to rush into any rash decisions anytime soon, as he potentially may have done when he was a little younger.

"I've become more mature and a lot more grown up. Normally I make good, sound decisions. You don't have to worry about me. My parents trust me."

Though Justin hasn't commented on the marijuana claims, he tweeted on Saturday that he wants to be a better person.

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)."