Lady Antebellum will sing on American Idol on Thursday (May 5). In addition, show judge Jennifer Lopez will perform "On the Floor" with the rapper Pitbull. The five remaining contestants will perform two songs on Wednesday (May 4) -- one modern song and one from the 1960s. Casey Abrams is the latest contestant to be eliminated from the show. The winner will be crowned on the season finale on May 25. As previously reported, Lady Antebellum will appear on the Billboard Music Awards, which will air live from Las Vegas on May 22 on ABC.