Lady GaGa and Stevie Nicks to Perform on 'American Idol' Finale

 Lady GaGa is going to perform on "American Idol", according to Perez Hilton. The report comes hot on heels of news that the Mother Monster has been tapped to mentor the four remaining contestants of the singing competition. While GaGa's help in mentoring is needed for the top 4 performances, her performance is reportedly set for the finale of the singing contest. The "Born This Way" hitmaker