Carrie Underwood makes her acting debut in the movie "Soul Surfer."  It's based on the true story of teen champion surfer Bethany Hamilton, who lost her arm in a shark attack when she was 13.   Underwood plays Hamilton's close friend Sarah Hill who encourages her to return to surfing after the attack.  Anna Sophia Robb plays the role of Hamilton.  Her parents are played by Dennis Quaid and Helen Hunt.  The movie opens nationwide April 8th.  Here's a trailer from the film