The Canadian is currently traversing the globe as he takes his Believe tour to his masses of screaming fans.

Speaking to MTV, manager Scooter Braun said that his client is most definitely in songwriting mode whilst on the road.

He said that Bieber has so many songs written that he has to group them by the city he creates them in. Braun said:

"Well I don't ever disclose what our plans are, but I will say this - he's been writing one to two songs a day for the entire tour and he actually labels them by the city he writes them in."

He continued: "We started calling it his 'music journal' and we're talking about what should come next musically. And I think creatively he just wants to share all his thoughts through music."

Speaking to the host about being in a committed relationship with the Hollywood actress, Timberlake described it as being married to his 'best friend':

"Every once in a while I can catch a glimpse of her when she doesn't see me looking and I have this moment where I'm like if you never make a good decision... if you only make bad decisions for the rest of your life. You made one really good decision."

''Because she's just like...it's nice to marry your friend. It's nice to marry your best friend. It suits me."

Timberlake, meanwhile, was today (April 24) confirmed as the host of the forthcoming 2013 Capital FM Summertime Ball, which will take place on June 9 at London's Wembley Stadium.

As previously reported, the 'All Time Low' star was recently forced to take a break from singing after discovering a reported hemorrhaging nodule on his vocal cord.

Sykes has received support from his bandmates as the lengthy recovery period begins - and Justin Bieber got in on the act too. He tweeted the ailing singer:

"Stay strong bro."

Sykes then replied: "Thanks mate. Hope to catch you soon :)."

The Wanted star meanwhile offered his thoughts on the news that JLS will split at the end of the year, tweeting: "Sad to hear about @JLSOfficial. Some of the nicest guys in the business. Good luck to them all in the future! :)."

The US star will introduce acts at the massive pop event, which is taking place at London's Wembley Stadium on June 9.

The '20/20 Experience' singer and actor has previously hosted the likes of iconic TV show Saturday Night Live.

The line-up for the concert is due to be announced on Thursday (April 25) at 8am UK time.

Last year's Summertime Ball featured the likes of Justin Bieber, Jessie J and Katy Perry.

The singer is regularly on the road as he performs to his many fans and it seems he has plenty of stories to tell.

Taking to Twitter today (April 23), the Canadian said that he is contemplating publishing tour memoirs. He said:

"Thinking about putting out my music journals from the road."

Bieber meanwhile later thanked his fans as he bypassed the 38m Twitter followers barrier, tweeting:

"#38MillionBeliebers #38MillionBeliebersStrong #FAMILY thru thick and thin #PROUD and not going anywhere. Love u all & Thank u for Believing."

He added: "Yeah my fans are passionate and maybe a little crazy. But they are my kinda crazy. #beliebers go hard. Love u."

The 'Believe' star has racked up tens of millions through his music career so far but it is claimed that his family haven't seen any of the money.

Speaking to The Sun, grandfather George Bieber said that he lives in the ground floor of a cold house in Canada due to a back problem.

However, he claimed that his grandson hasn't offered to help him out financially despite his troubles. He said:

"Justin might be worth £70 million but we certainly have never seen a penny of it. It's hard to imagine the money Justin has, as it's about as far removed from our life as you could get."

Referring to the singer's recent negative headlines, George Bieber said:

"When I hear about his behaviour I just wonder who on earth is looking after him as, believe me, this is not the loving little boy we always knew."

Last week, Gomez flew out to to Norway to spend time with the 'Baby' hitmaker just after appearing on the Ellen Show where she chatted about her former flame. Bieber is currently performing throughout Scandinavia as part of his 'Believe' tour.

Then on Saturday night, Bieber, who performed in Copenhagen, Denmark, posted (and then quickly deleted) a photo on Instagram of himself with Gomez, who seems to look happy about being back with her ex.

Last week, the Biebs created buzz on Instagram after posting a cartoon of him lying naked with a fan in bed.

Watch Selena Gomez discuss her relationship with Justin Bieber on Ellen last week here:

He wrote in TIME magazine's 100 Most Influential People list about Jimmy, "Picture this: I'm in the heart of an impromptu speech at my wedding reception in front of 150 guests, pouring it out to my lovely new bride. You could hear a pin drop. I paused for just a moment in between thoughts. And then there was Jimmy, shouting a joke from his seat, sparking an improv between the two of us that went on for a good five or 10 minutes and had all our guests roaring with laughter."

"But that's just Jimmy," Timberlake said. "Interrupting the groom's speech at the wedding reception? Cracking jokes when your buddy is looking desperately for the words to say that he hopes his wife will remember forever? It turned into a moment that everyone there will remember forever. Anyone else would have bombed on that stage. And then I would have kicked their ass."

Timberlake and Fallon are known for making headlines with their musical collaborations like "History of Rap" and Timberlake held a musical takeover of Late Night With Jimmy Fallon--"Timberweek"--last month.

Watch Justin Timberlake and Jimmy Fallon take on the History of Rap 4 here:

The US singer only just released comeback record 'The 20/20 Experience' earlier this year, but word has come out that he will unleash a second volume of the album near the end of 2013.

Speaking to Billboard, producer Jerome Harmon said that the record will include cuts that didn't make it onto the first volume, as well as some new tracks. He said:

"Before we came to the 10 [tracks on volume one] that he wanted and the two bonus tracks, we had over 30, 40 tracks."

He continued: "So I think he's going to go in, and we're going to take some of the stuff that we've already done, and of course create more music at the same time."

Harmon also revealed that recent single 'Mirrors' was actually written in 2009.

As previously reported, the Canadian singer hit the headlines recently after saying in the Anne Frank House guestbook that he hoped she would have been a 'Belieber'.

Whilst the museum defended the star, the general public reckoned the 'Boyfriend' man was displaying ignorance.

However, Frank's stepsister Eva Schloss told the Telegraph that she thinks Bieber would have actually been correct. She said of the media storm surrounding his comment:

"It's so childish. She probably would have been a fan. Why not? He's a young man and she was a young girl, and she liked film stars and music. They make a lot of fuss about everything that is connected with Anne Frank."