Just when you thought Demi Lovato's life couldn't get any more complicated, we're hearing that a sex tape featuring the barely legal singer/actress could leak any day now!

After going to rehab, punching her former BFF Alex Welch, sending nasty e-mails to Ashley Greene and a set of recently released raunchy photos (whew!), a source reveals that the teenage starlet videotaped herself getting it on with a young man over the summer.

Our source was working Demi’s concert in early August (less than two weeks before her 18th birthday), and they tell X17online exclusively that when they tried to enter her tour bus before a show, Demi's uncle Francisco Lovato, who was serving as a chaperone, wouldn't let them on board. He simply said Demi was "busy", but another member of Demi's tour crew tells X17online that the Disney starlet would "always kick people off the bus so she could bring random dudes on board and get nasty with them." It's not known whether Francisco was aware of what was going on behind closed doors, and he has yet to respond to our calls.

The source added that Demi was “no stranger to filming her sexual exploits,” and a tape of Demi and one of her boy toys “will surface soon.” It's not known when the footage was shot, but if it was after her birthday on August 20, it very well could end up in the lap of an adult video distributor, as she would no longer be considered underage.

So who was watching Demi while she was getting into all sorts of mischief? Our source tells X17online exclusively, "No one really cared about what she did or how she acted. It was truly sad to watch. She tried to act more adult by using foul language and showing her friends how rebellious she was, but she was so rude, everyone just made fun of her."

Seeing as these pictures of Demi and her gal pals having a wild (and unsupervised!) time have just popped up online, do you think a sex tape is next for the Disney starlet?