Entertainment Tonight got a behind-the-scenes look at Peter Berg's upcoming board game adaptation, Battleship.  In this ET segment, you'll get Rihanna being completely unconvincing as a navy officer (the character's tattoos "dirty her up a bit", and then I burst out laughing when she said "and of course, no make-up.") plus a breakdown of how the main characters are related to one another.  Helpfully glossed over: details of the whole alien invasion thing that pits battleships against spaceships.  There's probably nothing in this behind-the-scenes preview that's going to change the opinion you had after seeing the trailer.  You'll just get a better idea of how expensive the movie is.Hit the jump to check out the clip.  The film also stars Taylor Kitsch, Alexander Skarsgard, Brooklyn Decker, and Liam Neeson.  Battleship opens May 18, 2012.Clip via Entertainment Tonight.

Here’s the official synopsis for Battleship:

Peter Berg (Hancock) produces and directs Battleship, an epic action-adventure that unfolds across the seas, in the skies and over land as our planet fights for survival against a superior force. Based on Hasbro’s classic naval combat game, Battleship stars Taylor Kitsch as Lt. Alex Hopper, a Naval officer assigned to the USS John Paul Jones; Brooklyn Decker as Sam Shane, a physical therapist and Hopper’s fiancée; Alexander Skarsgard as Hopper’s older brother, Stone, Commanding Officer of the USS Sampson; Rihanna as Petty Officer Raikes, Hopper’s crewmate and a weapons specialist on the USS John Paul Jones; and international superstar Liam Neeson as Hopper and Stone’s superior (and Sam’s father), Admiral Shane.

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