Teen heartthrob singer Justin Bieber boards his tour bus outside the Grand Hotel in Stockholm on Tuesday, April 23, 2013. Swedish police on Thursday said they had found drugs on the bus but had no suspects and were unlikely to pursue the case further. (AP Photo/Scanpix Sweden, Leo Sellen)
Teen heartthrob singer Justin Bieber boards his tour bus outside the Grand Hotel in Stockholm on Tuesday, April 23, 2013. Swedish police on Thursday said they had found drugs on the bus but had no suspects and were unlikely to pursue the case further. (AP Photo/Scanpix Sweden, Leo Sellen)
Capuchin monkey "Mally" sits on the head of an employee in an animal shelter in Munich on April 2, 2013. Canadian singer Justin Bieber had to leave the monkey March 28 in quarantine after arriving in Munich without the necessary documents for the animal. (Associated Press)
** FILE ** This March 19, 2013, file photo shows Canadian singer Justin Bieber performing during a concert at Bercy arena in Paris. Bieber has visited the Anne Frank House in Amsterdam, with a museum spokeswoman saying the Canadian pop star wrote in the guestbook that he hoped Frank "would have been a Belieber" if she had lived. (AP Photo/Francois Mori, file)
** FILE ** This March 19, 2013, file photo shows Canadian singer Justin Bieber performing during a concert at Bercy arena in Paris. Bieber has visited the Anne Frank House in Amsterdam, with a museum spokeswoman saying the Canadian pop star wrote in the guestbook that he hoped Frank "would have been a Belieber" if she had lived. (AP Photo/Francois Mori, file)
Justin Bieber performs during the halftime show at the CFL Grey Cup championship football game between the Toronto Argonauts and the Calgary Stampeders on Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)
** FILE ** In this Monday, March 4, 2013, file photo, Canadian singer Justin Bieber performs at the O2 Arena in east London. Bieber is recovering after fainting backstage at a concert in London. (Photo by Joel Ryan/Invision/AP, File)
** FILE ** In this Monday, March 4, 2013, file photo, Canadian singer Justin Bieber performs at the O2 Arena in east London. Bieber is recovering after fainting backstage at a concert in London. (Photo by Joel Ryan/Invision/AP, File)
Cover art for Justin Bieber's "Believe Acoustic"
