Dennis Hopper's wife, Victoria Hopper was having an affair prior to the late actor's death -- at a time when Victoria says that she was "married and residing [with Dennis]" according to court documents obtained exclusively by RadarOnline.com.

Dennis had filed for divorce from Victoria before he died in May 2010, but the divorce was never finalized. Hopper's daughter, Marin, and the Dennis Hopper Trust are suing Victoria because they claim that she stole artwork that the estate is legally entitled to. Victoria has also filed a lawsuit of her own -- against Marin and the trust. Victoria and Dennis had one child together, a daughter, Galen who is 10 years old.