Cody Simpson performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Pitbull performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Psy performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Psy performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Psy performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Ryan Beatty performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Austin Mahone performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Pitbull performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Austin Mahone performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Calvin Harris performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Pitbull performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Ryan Beatty performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Pitbull performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Afrojack performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Ryan Beatty performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Pitbull performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Psy performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Ryan Beatty performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Austin Mahone performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Pitbull performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Austin Mahone performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Afrojack performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer

Ryan Beatty performs during the Jingle Bash concert at the Allstate Arena in Rosemont on Saturday, December 15th, 2012.

Jeff Knox | Staff Photographer