Jennifer Lopez, Adam Lambert ready for AMA stage (AP)

Jennifer Lopez, far right, rehearses a dance move with backup dancers for her performance in Sunday's 2009 American Music Awards, Thursday, Nov. 19, 2009, at the Nokia Theater in Los Angeles. (AP Photo/Chris Pizzello)AP - Jennifer Lopez plans to include fireworks and an on-stage costume change in her performance at the American Music Awards. "American Idol" runner-up Adam Lambert will incorporate leather and chains into his.