I guess it would depend on how big (and bad) of a LAG MP3 is, but I think I might 3 bet preflop.

edited to say that I'm also 3 betting the flop but again would depend on villian, edited again to say the reason that I 3 bet the flop is that we have odds to continue, and as our hand may be currently best, we might get BB or UTG to fold overcards, or one pair hands incorrectly.