Another high-profile case of alleged domestic abuse is making headlines.
"It was an attack. It was basically an attack," Sinclair told INSIDE EDITION's Jim Moret.
Sinclair and Marston had just moved in together at an apartment complex in Pasadena, east of Los Angeles. She said they had a minor disagreement over something trivial, their groceries, when Marston suddently lost his temper and became violent.
"He punched me and he kicked me. It was just shock," said Sinclair.
21-year-old Marston allegedly punched Sinclair so hard that it left a baseball sized bruise on her right arm. Marston, the son of Hugh and second wife Kimberley Conrad, denies hitting Sinclair.
Sinclair, the 2011 Playmate of the Year, has been compared to 50's pin-up queen, Bettie Page.
She said she doesn't want to press charges against Marston and said she has no intention of cashing in on the incident. All she wants is an apology.
Moret asked, "If Marston where sitting here right now, what would you say to him?"
Sinclair replied, "I'd say 'Why are you doing this? Why aren't you admitting what you've done and trying to get help for this?' "