Justin Bieber Graduates High School, Hangs Up On 'Mojo in the Morning' Interview

Age and education are certainly making Justin Bieber surly.

OK! GALLERY: SELENA GOMEZ & JUSTIN BIEBER GO FOR A ROMANTIC STROLL IN L.A. 

J. Bieb officially graduated from high school on June 28, but, much to the dismay of Ontario's St. Michael Catholic Secondary School's class of 2012, the pint-sized crooner didn't attend the ceremony. His name is on the program, though, so expect Bieliebers to plop down some cash to purchase those programs on eBay any day now.

Regardless of the fact that his new album, Believe, debuted at No. 1 and is breaking all sorts of records, the "Boyfriend" singer is a little sensitive when you compare him to that other Grammy winning boy wonder — Justin Timberlake.

When Mojo from "Mojo in the Morning" said the Biebs sounded like the SexyBack singer on his new album, the younger Justin was noticeably ruffled.

"Man, that's crazy, 'cause our voices sound nothing alike. I mean, I'm not trying to sound like anyone. Saying I sound like someone else is not really a compliment," he snarled. "I think if you were to say I heard some Justin Timberlake-esque things in your sound I would take that as a compliment."

The Biebs would later hang up on the shock jock when Mojo joked that One Direction's Harry Styles might hit on his mom, seeing as Harry has a penchant for older women.

OK! GALLERIES: JUSTIN BIEBER CELEBRATES THE RELEASE OF BELIEVE IN NYC

"I don't think you should worry about me and my mom with Harry Styles — worry about your mom, bro."

When Mojo mentioned his mother was dead, Justin hung up the phone.