MTV World Chart Express episode

I am looking for a song from the World Chart Express (2005 April)
That song begins with "La la laa - la la laa" and it is from 2005 I think (I saw in April of 2005, after April 9) it was sang by a female artist with dark hair and red or blue dress, and I am looking (and search) for its song title and artist name.. If someone can gives me, I would say "Thank you" to them..