On TV: John Mayer, JoJo, Ashlee Simpson

Pop acts on television this week include John Mayer, who performs on’The Tonight Show with Jay Leno’ on Monday; JoJo, who performs on ‘Live with Regis and Kelly’ on Monday and co-hosts ‘Total Request Live’ on Thursday; Maria Mena, who performs on ‘The Late Show with David Letterman’ on Tuesday; Ashlee Simpson, who visits ‘TRL’ on Tuesday; and Brooke Hogan, who appears on ‘Live with Regis and Kelly’ on Friday.