Actor Matthew Underwood has pleaded not guilty following his arrest for violating his probation earlier this month (Nov12).

The former star of Nickelodeon's popular Zoey 101 series was picked up by police outside Cloud 9 - the venue he co-owns in Port St. Lucie, Florida - on 7 November (12).

It came just months after the 22-year-old actor was arrested in April (12) on suspicion of cannabis possession and contributing to the delinquency of a minor. He pleaded no contest and was sentenced to 12 months probation.

Tmz.com reports that Underwood failed a drugs test and had not completed a substance abuse program - and he has now pleaded not guilty to violating his probation.