On TV: Kelly Clarkson, Jessica Simpson, Joey Fatone

Pop acts on television this week include ‘American Idol’ Kelly Clarkson, who performs on ‘The Tonight Show with Jay Leno’ on Monday; Nelly Furtado, who performs on ‘On Air with Ryan Seacrest’ on Tuesday; the Corrs, who perform on ‘The Tonight Show’ on Tuesday; Jessica Simpson, who performs on ‘The Early Show’ on Wednesday; Vanessa Carlton, who appears on ‘Total Request Live’ on Wednesday; *NSYNC star Joey Fatone, who appears on ‘Last Call with Carson Daly’ on Thursday; and ‘Idol’ reject William Hung, who performs on ‘On Air’ on Thursday.