Denise Richards is doubling down on her claim that estranged husband Aaron Phypers roughed her up while she was recovering from a cosmetic procedure … and now she’s telling it to a judge.

Denise took the stand Tuesday to testify in a restraining order hearing against Aaron … and she said he got violent with her back in May, after she had plastic surgery.

She told the judge Aaron was helping her recover from a procedure on her breast implants and a tummy tuck when he hit her in the head at the hotel where they were shacking up. She said Aaron hit her and demanded her phone.