The middle Jonas Brother - who stars in the upcoming Camp Rock 2 - has been linked to Twilight actress Greene in recent weeks after they were spotted together in Los Angeles.
However, when asked if he was "off the market" by Extra at the movie's New York premiere, he replied: "You know we're not going to talk about that... Nice try though!"
The 21-year-old was joined on the red carpet by his co-stars and brothers, including younger sibling Nick who told the website he was eager to watch the movie surrounded by fans.
"Being with the fans and watching it is a completely different experience," he said. "We cheer and laugh at the wrong points because we know what went into making that scene so we have those inside scoops into things that go over everybody else's heads!"
Camp Rock 2 premieres September 3 on Disney Channel in the US and September 17 on Disney Channel in the UK.
