Aaron Carter may not be happy his pregnant ex entered adult entertainment.

Melanie Martin made her debut on live-streaming porn site CamSoda last week, and we hear she “performed” with “new girlfriend Vero.” They apparently also released a sex tape.

But Carter “is going ballistic,” claims a source. “He originally wouldn’t allow her to have her computer,” but we hear CamSoda provided equipment. Carter’s rep tells us this is “fake news.”

The singer questioned his paternity in a recent interview, saying Martin was “doing things behind my back she shouldn’t have been doing.”