The 45-year-old actor is accused of punching Heather Bormann in the early hours of Sunday morning when she refused to let him on a bus that had been rented by a bachelor party he was involved with in Cleveland, Ohio.
Heather has confirmed she will be pressing charges and claims he was "inebriated" when the altercation happened.
She told website TMZ: "I told him several times that he was trespassing, that it was a private party. He never said a word to me, he just stood there staring at me. He was inebriated and the smell of him was like a bar. After the third time I told him to get off my bus, he just stepped in for a right hook to my pelvis area and started wailing on me like I was a man.
"I had no idea who he was at the time. I did not know until after he was in custody. I`m pressing charges. Assault is wrong, I really do feel violated. He was hitting me in places I didn`t think anybody would hit me... my breast area, my pelvis area."
Former `Lost` star Matthew had to be pulled away by three men and he was detained by an off-duty police officer until law enforcement arrived.
He was arrested but later released, although police are continuing to investigate.