On TV: Ashlee Simpson, Duffs, Vanessa Carlton

Pop acts on television this week include *NSYNC, who sits down with ‘Total Request Live’ on Monday; Ashlee Simpson, who performs on ‘On Air with Ryan Seacrest’ on Tuesday; Hilary Duff and Haylie Duff, who appaer on ‘The View’ on Wednesday while Hilary goes solo on ‘TRL’ on Thursday; Robbie Williams, who performs on ‘The Tonight Show with Jay Leno’ on Wednesday; Vanessa Carlton, who previews her new music on ‘TRL’ on Wednesday; and Alanis Morissette, who perform on ‘The Tonight Show’ on Thursday.