In the press conference for the film, the singer-turned-actress talks about meeting director Peter Berg, her tough personal training for the role and the differences between her live shows and the movies.
Battleship is released in the UK on April 11 and hits US cinemas on May 18.
> Rihanna makes movie debut in 'Battleship' - pictures
> Rihanna denies Ashton Kutcher romance: 'I'm happy and I'm single'
Watch Rihanna in the Battleship trailer below:
Move through our gallery of the Battleship photocall in London below: