On TV: Lindsay Lohan, Celine Dion, Maroon 5

Pop acts on television this week include Lindsay Lohan, who appears on ‘The Tonight Show with Jay Leno’ on Monday and ‘The Ellen DeGeneres Show’ on Thursday; Celine Dion, who performs on ‘The Tonight Show’ on Tuesday and ‘The Ellen DeGeneres Show’ on Friday; John Mayer, who appears on ‘Last Call with Carson Daly’ on Tuesday; Maroon 5, who appear on ‘Daily Download’ on Tuesday and ‘Total Request Live’ on Wednesday; ‘American Idol’ season one champ Kelly Clarkson, who performs on ‘The Late Late Show’ on Tuesday; Jem, who appears on ‘The Ellen DeGeneres Show’ on Wednesday; Avril Lavigne, who performs on ‘Live with Regis and Kelly’ on Thursday; Ashlee Simpson, who performs on ‘The Tonight Show’ on Friday.