(CBS NEWS) When Justin Bieber walked up to the stage Sunday night to accept the fan-voted Milestone Award at theBillboard Music Awards, one thing he probably didn't expect was aroom full of boosfrom the crowd.

The boos, though, were mixed with cheers at the MGM Grand in Las Vegas. Looking surprised by the audience's reaction, Bieber hesitated to speak at first, unsure how to react to the crowd. After all, he walked up to the stage to accept afan-votedhonor. He stood at the mic for a while looking befuddled before launching into his acceptance speech.

"I'm 19 years old, I think I'm doing a pretty good job and basically, from my heart, I really wanna say it should really be about the music," he said. "It should be about the craft, the craft that I'm making."

The Canadian singer added, "This is not a gimmick. I'm an artist and I should be taken seriously and all this other bull should not be spoken of. I wanna thank my manager, Scooter Braun. I wanna thank my family at home. I wanna thank my mother, my father, I wanna thank Jesus Christ. Mom, I love you so much. Dad, I love you. Little brother and sister, I love you so much. Thank you guys so much. Fans, you're incredible."

Bieber topped several other stars for the award, including Bruno Mars and Taylor Swift. He also took home the top male artist honor on Sunday night.

Earlier in the evening, Bieber sang "Take You" and also took the stage with for a performance of "#thatPOWER."

Following the awards ceremony, Biebertweeted: "I love music, my fans, my family, my friends.. And I love The Lord."

Meanwhile, Bieber and Selena Gomez havesparked speculationthat they may be back together again after getting cozy in Las Vegas over the weekend.

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