Official Website of Demi - http://demilovato.com/

The page on Facebook - http://www.facebook.com/pages/Demi-Lovato/

Another site Demi - http://demilovatofanclub.net/

Demi on myspace - http://www.myspace.com/demilovato

official site - http://selenagomez.com/ 
on myspace - http://www.myspace.com/selenagomez 
youtube - http://www.youtube.com/selenagomez 
and twitter - http://www.twitter.com/selenagomez