Shania Twain,Rascal Flatts,Shakira,And Lady Antebellum On American Idol Next Week...

Rascal Flatts joins Lady Antebellum, Shania Twain and Shakira as confirmed guests on this week's American Idol, televised April 28.

Lady Antebellum will perform "Need You Now" and Rascal Flatts is scheduled to perform "Unstoppable." Rascal Flatts will also join Shakira when she sings her song "Gypsy."

Of course, Lady Antebellum was the big winner at the recent CMA awards, too, winning single of the year, song of the year, and top vocal group honors.

As fans know, Rascal Flatts appeared on 'American Idol" almost five years ago -- in May of 2005 -- as the musical guest of Carrie Underwood the night she took the top honors in the competition. Rascal Flatts also appeared on Idol Gives Back in 2007.