ACTOR ANDREW KEEGAN TASED, ARRESTED

Actor Andrew Keegan was tasered and handcuffed last night ... after getting into a scuffle with cops.
Multiple witnesses tell TMZ ... Keegan -- who has starred in a bunch of movies and TV shows  including "10 Things I Hate about You" and "7th Heaven" -- was throwing a party in Marina Del Ray last night when cops rolled up and asked him to turn down the music. Witnesses say Keegan refused and became "very aggressive."