The 29-year-old former backing dancer - who is filming a guest spot on hit teenage basketball drama 'One Tree Hill' - stunned cast and crew on the North Carolina set by openly lighting up illegal cannabis cigarettes.
A source told the New York Daily News newspaper: "He is smoking marijuana all round the set, like it is just part of his lifestyle. The smell is so potent it's obvious that he is not just smoking regular cigarettes.
"He doesn't seem to see a need to hide it at all."
Kevin has also been making his presence known in the town of Wilmington with his generous tipping.
One local bartender said: "I have served him a few times and he has always been really generous. He once left me a $600 tip for just two beers."
Earlier this month, Kevin won custody of his two sons with ex-wife Britney Spears, after she failed to attend one court-ordered drugs test.
The 'Toxic' singer is currently fighting to regain 50-50 custody of Sean Preston, two, and 13-month-old Jayden James.
Britney, 25, and Kevin must appear in court at a hearing on October 26.
Filed under: Britney Spears • Celebrity • Kevin Federline •
