Are you ready for some football? The 2013 NFL season is getting into full swing, and while football fans will be tuning in with their TVs or packing into the stadiums this season, many of your favorite stars will be among the crowds. Ashton Kutcher and Mila Kunis showed their Chicago Bears pride in Pittsburgh, PA, this weekend, while fellow actor Joe Manganiello is an avid Steelers fan. Kate Mara has also been one to hit the sidelines, and Marisa Miller showed off her adorable little San Francisco 49ers fan during a preseason game this year. See all the stars who are cheering on the return of football!