Axl Rose is suing his former manager for $5 million for trying to sabotage his career.
Irving Azoff originally filed a suit against Axl in March for reportedly not paying him the agreed percentage of earnings from a tour.
But now the rocker has fired back, and is suing Irving for having "abandoned Guns N' Roses on the eve of a major tour, filing suit for commissions he didn't earn and had no right to receive".
Axl is also accusing Irving of not properly promoting his long-awaited 2008 album 'Chinese Democracy' in an attempt to bully him to reform with the original line-up - which included guitarist Slash and bassist Duff McKagan.
'Chinese Democracy' was the Guns N' Roses album made by Axl and various musicians which took around 14 years to make and failed to reach the heights of the band's 90s heyday.
Axl is demanding more than $5 million in damages for breach of fiduciary duty, constructive fraud and breach of contract.
Irving said: "On advice of counsel I cannot respond at this time, but will discuss in my upcoming book, 'My Life with William Bill Bailey'."
William Bill Bailey is Axl's childhood name, and the 'Welcome to the Jungle' star believes Irving is taking a swipe at him by filing the lawsuit in that name.
According to a source, the name William Bailey "carries significant emotional damage from Rose's childhood" which Irving would have known about from numerous personal conversations.