T.I. & Son You Ready for Some Football?

10/10/2011 5:00 AM PDT

T.I. is making up for lost dad time -- after 11 months in federal custody, the rapper spent last Saturday afternoon at his son's football game in Atlanta ... and his reality TV crew filmed the entire heartwarming bonding sesh.

T.I.'s son, Clifford “King” Joseph Harris III -- one of his five biological children -- turned 7 on August 25th ... four days before the rapper was released.

You can tell from the pics -- T.I. had a field day.