Kesha suffers another setback in court battle with Dr Luke

Singer Kesha has lost another round in her legal battle against record producer Dr Luke, who she accused of rape and abuse.

A New York judge rejected the singer's motion to file an amended complaint against him.

It comes after the same judge denied Kesha's request for an injunction against her former producer after he sued her for breach of contract.

The producer, real name Lukasz Gottwald, accused Kesha of trying to obtain a better record deal and not fulfilling her contract.

Kesha responded by accusing him of sexual abuse in two separate incidents and released emails between Dr Luke and her manager, where he allegedly says she "can be more disciplined with her diet".

The 43-year-old producer denied claims of sexual assault and released a string of emails himself from Kesha's team, where they allegedly discuss Kesha's desire to change her appearance.

"We must get her working out again, sticking to a meal plan, discussing with her nutritionist the best ways to discuss weight gain or possibly her returning to rehab," an email from Kesha's manager allegedly reads.

After losing a court case in California and another in New York - including the sexual and verbal abuse claims - Kesha is accusing Dr Luke of having a "vendetta".

"Dr. Luke has aggressively sought to financially destroy Kesha by keeping her under his control while simultaneously waging a nuclear litigation campaign against her," her lawyers claimed.

"It is a vendetta against Kesha. She is not demanding more money," they explained.

"Kesha asks for something far more basic: the freedom to make music without being bound indefinitely to the very producer who subjected her to years of abuse and continues that abuse to this day."

The singer wants to continue work on her third album without Sony or Dr Luke.

The judge on Tuesday ruled Kesha could not advance with any further claims while in breach of contract and took note that Dr Luke's accountants calculated a $1.3m debt, which Kesha allegedly owes in royalties.