On TV: Justin Guarini, Kelly Clarkson, Justin Timberlake

Pop acts performing on television this week include Justin Guarini, who performs on the Tonight Show with Jay Leno on Tuesday; Jewel, who performs on the Late Late Show with Craig Kilborn on Wednesday; Kelly Clarkson, wo appears on The Daily Show with Jon Stewart on Wednesday; *NSYNC star Justin Timberlake, who performs on the Tonight Show on Thursday; *NSYNC star Joey Fatone, who appears on the Late Late Show on Thursday; ‘American Idol’ stars Kelly Clarkson and Justin Guarini, who appear on MTV’s Total Request Live on Thursday along with Wade Robson; Guarini also makes a Thursday appearance on The View; and Jewel, who performs again on Last Call.