How did Justin Bieber become so charismatic at only 15 years old? "It just kinda happened naturally," the teenage heartthrob told TV Guide Network's red carpet hosts Carrie Ann Inaba and Chris Harrison at the Grammys. Bieber explains how YouTube helped him get so big and gives advice to other aspiring singers. Plus: Carrie scores a smooch!

Top Moments: The year the Grammys mismatched everyone

Watch the video:

Watch Grammy Awards Fashion Wrap with Carrie Ann Inaba Monday,