Meek Mill -- Free At Last ... Released From Prison

5:55 PM PT -- Meek just posted his first pic after prison -- chilling in a living room and cracking jokes about a friend's broken foot. Good to be home.

Christmas has come early for Meek Mill ... he's getting out of prison today.

Mill has been in a Philadelphia correctional facility since July ... when a judge sentenced him to 3-6 months behind bars for violating probation.

Mill was granted parole on the condition he complete a community service and treatment program. It's unclear exactly what that program will involve, at this point.