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Sean Young is still feeling the effects of her late-night brawl outside the Academy Awards' Governors Ball at the Oscars. Yikes ... she's now sporting a neck brace!

The 52-year-old actress was arrested for reportedly slapping a security guard, but she claims it was his fault.

Following the incident, Young told X17online, "I was well-behaved. It was fine... and the surveillance tape will bear that out … It's atrocious behavior on the Academy's part."

Young says she's still waiting for an apology from the Academy. You know what they say, if the brace fits ...