On TV: Clay Aiken, Britney Spears, Christina Aguilera

Pop acts on television this week include ‘American Idol’ runner-up Clay Aiken, who performs on ‘Live with Regis and Kelly’ on Monday; the first round of ‘Oprah’s Pop Star Challenge’ also airs Monday’s ‘Oprah’, where 15,000 hopefuls will battle for the title; ‘American Idol’ finalist Kimberly Caldwell, who appears on ‘On Air with Ryan Seacrest’ on Monday; Britney Spears, who appears on ‘On Air’ on Wednesday and ‘The Ellen DeGeneres Show’ on Thursday; Christina Aguilera, who appears on MTV’s Total Request Live on Wednesday; and Kylie Minogue, who performs on ‘The Late Show with David Letterman’ on Thursday.