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Both Demi and Selena are pretty. However I would call Demi the hotter of the two. She has that certain something. I don't think Demi has guest starred on Selena's show. They probably do not need to cross market themselves. They are both very popular with the Disney demographic.
Demi and Selena first met way back when they were are the Barney show. I confess that I never really watched Barney or noticed these two. They got my attention now. Especially Demi. You go girl.