LOS ANGELES (AP) — This year's MTV Movie Awards will be a showdown between a bevy of bridesmaids and a cast of killer kids.MTV says "Bridesmaids" and "The Hunger Games" top nominees with eight nods apiece, including bids for best cast, breakthrough performance and movie of the year. Also up for best picture are "Harry Potter and the Deathly Hallows: Part 2," ''The Help" And "The Twilight Saga: Breaking Dawn-Part 1."MTV announced nominees Monday in 12 categories, including six new ones such as "best on-screen dirtbag" and "best gut-wrenching performance."Fans can choose the winners by voting online beginning Tuesday at 8 a.m. Eastern time.The 21st annual MTV Movie Awards will be presented June 3 at the Gibson Amphitheatre in Universal City, Calif., and broadcast live on MTV.___Online: http://www.mtv.com/ontv/movieawards/2012/