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Janet will open, Whitney will sing, Eminem will rap, Shakira will shake, Glambert will rock, and Taylor will take on Michael for artist of the year at the American Music Awards at 7 p.m. Sunday on ABC.

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.Lopez and Lambert will be among more than a dozen performers at Sunday's ceremony, and they took time out Thursday to perfect their performances.Lopez is in top form, but she's still a little nervous. She'll be singing a song fans have never heard before and performing live on TV for the first time in years.She's set to perform "Louboutins," the first single from her new album, "Love?" - due in stores next year. Flanked by backup dancers, the 40-year-old entertainer busts out her Fly Girl moves in a number that begins in a boxing ring and ends in the audience. Famed sports announcer Michael Buffer is in the act, too.Lambert, 27, said he's eager to see how the star-studded crowd responds to his provocative performance, a sexed-up.