On TV: Jennifer Lopez, Hilary Duff, Nick Lachey

Pop acts on television this week include Jennifer Lopez, who appears on ‘Inside the Actors’ Studio’ tonight with James Lipton, ‘The Late Show with David Letterman’ on Wednesday, ‘Good Morning America’, ‘Live with Regis and Kelly’, and ‘Total Request Live’ on Thursday, and ‘The Early Show’ on Friday; Hilary Duff, who appears on ‘The Ellen DeGeneres Show’ on Tuesday; Lindsay Lohan, who appears on ‘TRL’ on Tuesday; Jem, who performs on ‘Jimmy Kimmel Live’ on Wednesday; 98 Degrees star Nick Lachey, who appears on ‘The Ellen DeGeneres Show’ on Thursday; Celine Dion, who performs on ‘The Oprah Winfrey Show’ on Thursday.