*Singer Lauryn Hill , who is already being sued by her former guitarist Jay Gore for stiffing him for over $3500, is now being sued again by the musician, reports tmz.

In the new lawsuit, the ex-band member says the Grammy winning singer constantly verbally abused members of her band behind the scenes during their European tour in 2007.

Professional guitar player Jay Gore has filed new legal docs in his war with Hill — in which he claims she stiffed him out of thousands of dollars after playing Hill’s tour.

In the docs, Gore says Hill was a total monster backstage — claiming she “exhibited the type of behavior for which she had gained public notoriety which contributed to a hostile work environment.”

Gore says, “After shows, Hill would demand that the musicians and road support personnel attend meetings where she would engage in a person-by-person critique and berating.”

He continues, “At one point, Hill made a statement in front of the tour personnel to the effect that ‘I can’t believe I am paying you fools, you should be paying me.'”

Gore says he now wants more than $20k for his troubles. His lawyer, Nicholas Andrea, tells us, “We believe there are other musicians who have been mistreated by Ms. Hill in a similar manner who are reluctant to stand up for their rights and this lawsuit gives them a voice as well.”

Calls to Hill’s rep have not been returned.