Teen heartthrob Justin Bieber has earned a diploma from a Catholic secondary school in his native Ontario, Canada, but did not attend the graduation ceremony, the head of the school told AFP. Tim Doherty said Monday that the 18-year-old star had been granted a diploma from St. Michael Catholic School in Stratford but did not attend the graduation ceremony on June 28. Bieber shot to fame in 2009 after posting several homemade music videos on YouTube, and in March 2011 set the record for the most views on the video-sharing site with his music video \"Baby.\" As of Tuesday, the video had more than 750 million views.