Ronnie Ortiz-Magro is bloodied, bruised and battered.

There is no debate over statement, not after the Jersey Shore star shared photos of his face with Us Weekly.

The question is whether or not baby mama Jen Harley is responsible for this appearance.

Ronnie says yes. He has filed a police report against Harley, alleging she tossed an ashtray at him on New Year's Eve.

For her part, Jen has not said anything about this particular incident -- but she has accused Ronnie of destroying her home.

The situation between these reality stars could not be uglier, and we have the latest update (including one of these bloody Ronnie photos) below...