Tom Jones

Wednesday night’s “American Idol” finale was packed with celebrity guests. Some of these stars— like Lady Gaga, Beyonce and Bono — were easily recognizable to audience members of all ages. Others may have had some younger “Idol” viewers wondering, “Who is that?”As the Post’s Lisa de Moraes points out in her recap of the finale, “Idol” finalists and previous contestants got to perform with some