When the Jonas Brothers canceled their tour just two days before it was set to kickoff fans were shocked and disappointed, but a new report points the finger at Joe Jonas, claiming the middle brother has a secret drug problem that prevented the band from touring.

"He's been dealing with substance abuse issues for quite some time," an insider told Star magazine of Joe, noting that his management team, friends and family "have been begging him to seek help.

"The tour would have never survived with how Joe was behaving."

The brothers — Kevin, 25, Joe, 24 and Nick, 21 --  have long maintained a wholesome reputation with fans, including purity until marriage, despite reports in March of a sex tape existing between Joe and girlfriend Blanda Eggenschwiler.

Joe's rep dismissed the story saying, "There is no truth or validity to the story. It is completely false."