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2013 NFL Kickoff celebrations
Take a look as the NFL celebrates the start of the 2013 season.

Ciara performs at The NFL Kickoff Eve Party, Wednesday, Sept. 4, 2013, in Baltimore. (Photo by Nick Wass/Invision/AP)

Fuel Up to Play 60 students are seen at the NFL PLAY 60 Youth Football Festival on Thursday, Sept. 5, 2013 in Baltimore. Students will continue lessons learned tat the event throughout the school year. (Larry French / AP Images for National Football League)

Jamal Lewis, right, is seen with Fuel Up to Play 60 students at the NFL PLAY 60 Youth Football Festival on Thursday, Sept. 5, 2013 in Baltimore. Students will continue lessons learned tat the event throughout the school year. (Larry French / AP Images for National Football League)

The Vince Lombardi trophy is displayed during a news conference at Tiffany and Co. in New York, Wednesday, Sept. 4, 2013. (AP Photo/Seth Wenig)

Former New York Giant David Tyree holds the Vince Lombardi Trophy during a news conference at Tiffany and Co. in New York, Wednesday, Sept. 4, 2013. (AP Photo/Seth Wenig)

A photographer takes pictures of the Vince Lombardi trophy during a news conference at Tiffany & Co. in New York, Wednesday, Sept. 4, 2013. The retrieval of the trophy from Tiffany & Co. is one of many events leading up to the Super Bowl in New Jersey on Feb. 2, 2014. (AP Photo/Seth Wenig)

Orlando Pace coaches Fuel Up to Play 60 students at the NFL PLAY 60 Youth Football Festival on Thursday, September 5, 2013 in Baltimore, MD. Students will continue lessons learned tat the event throughout the school year. (Larry French / AP Images for National Football League)

Ciara performs at The NFL Kickoff Eve Party, Wednesday, Sept. 4, 2013, in Baltimore. (Photo by Nick Wass/Invision/AP)

Ciara performs at The NFL Kickoff Eve Party, Wednesday, Sept. 4, 2013, in Baltimore. (Photo by Nick Wass/Invision/AP)

Ciara performs at The NFL Kickoff Eve Party, Wednesday, Sept. 4, 2013, in Baltimore. (Photo by Nick Wass/Invision/AP)

A general view of the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

People are seen at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

People are seen at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

People are seen at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

People are seen at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

People are seen at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Former Baltimore Ravens guard Mike Flynn (R) signs autographs at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

People are seen at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Former St. Louis Rams tackle Orlando Pace signs autographs at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Former Baltimore Ravens guard Mike Flynn (R) signs autographs at the NFL Kickoff Village on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Baltimore Ravens cheerleaders are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

NFL Commissioner Roger Goodell speaks at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)

Runners and participants are seen at the NFL Back to Football Run on Wednesday, September 4, 2013 in Baltimore, MD. (Larry French / AP Images for National Football League)