Newly crowned Super Bowl champ Jaydon Mickens is in trouble with the law ... TMZ Sports has confirmed the Tampa Bay Buccaneers player was arrested last week in Los Angeles.
Law enforcement tells us the 26-year-old -- a Bucs receiver and return specialist -- was pulled over on March 5 after cops say his window tint was too dark.
During the stop, we're told officers found a gun inside the car -- NOT on his person -- and arrested him over it.
Mickens was booked on a felony concealed weapon charge. We're told the LAPD later informed the NFL of the arrest.