Adam Lambert is locked in to perform on the season finale of American Idol next week.
The Hollywood Reporter , which recently reported that the season-eight runner-up had been approached to appear on the show, says that Adam will team up with finalist Angie Miller .
In addition, the country group The Band Perry will perform with the recently-eliminated Janelle Arthur . Legendary crooner Frankie Valli will sing with the top five male contestants.
Former American Idol judge Jennifer Lopez -- whom the show's executives reportedly are pursuing to rejoin the panel -- is also said to be among the musical guests for the finale, which will air May 16 on Fox.
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