(Cover) - EN Music - Justin Bieber scooped four awards at last nights American Music Awards (AMAs).

The 16-year-old pop sensation received the coveted Artist of the Year trophy, beating artists such as Lady Gaga, Katy Perry and Eminem and making him the youngest artist ever to do so.

The handsome singer was also honoured with T-Mobile Breakthrough Artist of the Year, Favourite Male Pop/Rock artist, and Favourite Album for My World 2.0.

When receiving the Artist of the Year trophy, a thrilled Justin invited Usher to the stage, as the R&B sensation famously helped launch Justins career. The teen pop sensation called Usher "not only my mentor but my best friend and my big brother".

The ceremony took place at Los Angeles Nokia Theatre, and featured outstanding performances from artists including Miley Cyrus and Black Eyed Peas.

Rihanna opened the awards with a medley of her hits such as Love the Way You Lie (Part 2), What's My Name and Only Girl (In the World). The gorgeous star also received the Female Soul/R&B Artist award, although before her name was announced upcoming rapper Nicki Minaj took a moment to shout-out her new album.

Other winners on the night included Usher who picked up two awards for Male Soul/R&B artist and for his album, Raymond v. Raymond. Eminem also won two gongs - for Male Rap/Hip-hop artist and for his album, Recovery.

The list of AMA winners:

ARTIST OF THE YEAR

Justin Bieber

POP/ROCK

Male Artist: Justin Bieber

Female Artist: Lady Gaga

Band, Duo or Group: The Black Eyed Peas

Album: Justin Bieber, My World 2.0

SOUL/R&B

Male Artist: Usher

Female Artist: Rihanna

Album: Usher, Raymond Vs. Raymond

RAP/HIP-HOP

Male Artist: Eminem

Album: Eminem, Recovery

COUNTRY

Male Artist: Brad Paisley

Female Artist: Taylor Swift

Band, Duo or Group: Lady Antebellum

Album: Carrie Underwood, Play On

ADULT CONTEMPORARY

Artist: Michael Bubl

ALTERNATIVE ROCK

Artist: Muse

LATIN

Artist: Shakira

CONTEMPORARY INSPIRATIONAL

Artist: MercyMe

SOUNDTRACK

Album: Glee: The Music, Volume 3--Showstoppers

T-MOBILE BREAKTHROUGH ARTIST

Justin Bieber (C) Cover Media