Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs as part of Justin Bieber's Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs as part of Justin Bieber's Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Sheridan Young, 11, left, and her friend Madison White, 10, both of Lake Bluff, cheer as they watch Justin Bieber perform during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen performs as part of Justin Bieber's Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen and Cody Simpson perform as part of Justin Bieber's Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Fans cheer as Justin Bieber performs during a performance on the Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Carly Rae Jepsen and Cody Simpson perform as part of Justin Bieber's Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs as part of Justin Bieber's Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs as part of Justin Bieber's Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Cody Simpson performs as part of the Justin Bieber Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer

Justin Bieber performs at the Allstate Arena Tuesday night in Rosemont.

Jeff Knox | Staff Photographer

Sheridan Young, 11, left, and her friend Madison White, 10, both of Lake Bluff, cheer as they watch Justin Bieber perform during his Believe tour at the Allstate Arena in Rosemont on Tuesday, October 23, 2012.

Jeff Knox | Staff Photographer