Christina Aguilera's performance at the 2011 American Music Awards fueled an outburst of more "fat" and "pregnant".

Holiday cheer filled the American Music Awards on Sunday night when Justin Bieber took to the stage to perform his festive hit "Mistletoe".

Gallery [4]

Photos from the 2011 American Music Awards held at Nokia Theatre LA LIVE on November 20, 2011 in Los Angeles, California.

3rd Gallery

Photos from the 2011 American Music Awards held at Nokia Theatre LA LIVE on November 20, 2011 in Los Angeles, California.

2nd Gallery

Photos from the 2011 American Music Awards held at Nokia Theatre LA LIVE on November 20, 2011 in Los Angeles, California.

1st Gallery

Photos from the 2011 American Music Awards held at Nokia Theatre LA LIVE on November 20, 2011 in Los Angeles, California.